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You can play a slot machine in Las Vegas before you’ve even reached baggage claim: there are tiny slots parlors in every terminal of McCarran International Airport. Once you pick up your rental car, you can stop for gas and play slots at a convenience store. And that’s all before you’ve even reached your hotel-casino, which — if it follows the modern standard — dedicates roughly 80 percent of its gaming floor to slots, and only 20 percent to table games.

Bally Technologies, one of the world’s largest manufacturers of slot machines, is headquartered 3 miles south of the Strip. When I visited Bally in mid-March, Mike Trask, the company’s senior marketing manager, walked me into the company’s showroom to play some games. Compared to the cacophony of a casino floor, Bally’s showroom was practically monastic, the lights low and the room silent apart from the soothing hum of two dozen hibernating consoles.

Trask, a tall man in his 30s with dirty-blond hair, showed me the company’s new Friends-themed game, installed on Bally’s ProWave cabinet, a slick, 42-inch curved console. Friends celebrated its 20th anniversary last year, and the company hopes to tap some of that nostalgia. 'That person, that girl who watched every episode of Friends when it came out, is our demographic,' Trask said, standing alongside the cabinet.

I took a seat in front of the unit, and Trask touched a logo on the display’s upper corner, selected a box on the display that ensured I would get a bonus round, and told me to hit the spin button. I did, and a pared down version of the show’s theme song played, the NBC sextet smiled at me from the prime of their youth, and five reels of symbols — a Central Perk decal, a guitar, screenshots of characters — scrolled down the screen. The Wheel of Fortune-style bonus round featured a clip of Rachel saying, 'Happy birthday, Grandma!' wearing a wedding dress.

Bally assembles all of its machines in a factory warehouse next to its game studios and tucked behind its Vegas corporate headquarters. Last year, Scientific Games, Bally’s parent company, shipped out more than 17,000 new units. On my visit, hundreds of freshly assembled slot machine shells, featuring the industry standard black exterior and jutting dashboards, lined the warehouse walls.

A tag attached to each cabinet indicated its destination: Oklahoma, Washington, Michigan, Canada. Only a handful were destined for Vegas casinos, a sign of gaming’s national and international expansion. Scientific Games acquired Bally last year for $5 billion. At the time, 23 states had legalized gambling, a heavily taxable industry, to quickly infuse deficient coffers.

But the expansion of gaming generally is the expansion of slot machines specifically — the modern casino typically earns 70 to 80 percent of its revenue from slots, a stratospheric rise from the 1970s when slots comprised 50 percent or less. New York, the latest state to introduce gaming, doesn’t even allow table games, and Pennsylvania, now the third-largest gaming state in the country after Nevada and New Jersey, only later allowed table games in an amendment to its legislation. And increasingly, the psychological and technical systems originally built for slot machines — including reward schedules and tracking systems — have found admirers in Silicon Valley.

In the factory, Trask and I passed a ProWave cabinet, a design released by Bally in mid-2014 that features a 32-inch concave screen, like an even more curved Samsung TV. Trask claimed that putting the same exact games on curved screens increased gameplay 30-80 percent. I asked him why that was. 'It looks cool; it’s incredibly clear,' he said in a tone suggesting a guess as good as any. Game designers are charged with somehow summoning the ineffable allure of electronic spectacle — developing a system that is both simple and endlessly engaging, a machine to pull and trap players into a finely tuned cycle of risk and reward that keeps them glued to the seat for hours, their pockets slowly but inevitably emptying. As we stood over the gaming cabinet, Trask told me about the floor of the MGM, home to 2,500 machines and hundreds of different games. Trask’s mission, as he saw it, was simple: 'Our job is to get you to choose our game.'

The prototypical slot machine was invented in Brooklyn in the mid-1800s — it was a cash register-sized contraption and used actual playing cards. Inserting a nickel and pressing a lever randomized the cards in the small display window, and depending on the poker hand that appeared, a player could win items from the establishment that housed the machine. In 1898, Charles Fey developed the poker machine into the Liberty Bell machine, the first true slot with three reels and a coin payout. Each reel had 10 symbols, giving players a 1-in-1,000 chance of hitting the 50-cent jackpot if three Liberty Bells lined up. The three-reel design was a hit in bars and became a casino standard, but for decades gaming houses considered them little more than a frivolity — distractions for the wives of table-game players. Accordingly, casinos were dense with table games, and slots were relegated to the periphery.

That began to change in the 1960s, when Bally introduced the electromechanical slot machine. The new rig let players insert multiple coins on a single bet, and machines could multiply jackpots as well as offer up smaller, but more frequent wins. Multi-line play was introduced: alongside the classic horizontal lineup, players could now win with diagonal and zig-zagged combinations. The new designs sped up gameplay and breathed life into the stagnating industry.

William 'Si' Redd, the bolo tie-wearing Mississippi native who oversaw some of Bally’s new projects during the era, was instrumental to that renaissance. 'The player came to win,' he said, 'he didn’t come to lose, [so] speed it up, give him more, be more liberal. Let him win more, but then [you make money] still with the speeding up, because it was extra liberal.' In other words, the new machines lowered slots’ volatility — gaming parlance for the frequency at which a player experiences big wins and losses.

The casino floor of the Boulder Club, early 1950s. Image courtesy of the University of Nevada, Las Vegas

In the 1970s, Redd left Bally and founded another gaming manufacturer that was later renamed IGT. IGT specialized in video gambling machines, or video poker. Video poker machines could be designed to have even lower volatility, paying players back small amounts on more hands. And video poker’s interactive elements made them extra engrossing, turning them into an enormous success: people lined up to play the first machines, and the game’s ability to command a player’s complete concentration for hours gave it a reputation as the 'crack cocaine' of gambling.

'If you were to take $100 and play slots, you’d get about an hour of play, but video poker was designed to give you two hours of play for that same $100,' Redd said at the time, instructing game designers to lengthen the time it took a poker machine to consume a player’s money.

Redd also acquired the patent for the newly created Random Number Generator, which computerized the odds-calculator behind the spinning reels and allowed game makers to control volatility. A modern slot machine, at its core, is nothing more than an RNG going through millions or billions of numbers at all times. When a player hits a spin button, they are simply stopping the RNG at a particular moment. Everything beyond that — the music, the mini-games, the actual appearance of spinning reels, Rachel, Monica, and the rest of the gang keeping you company — is window dressing to keep you hitting spin.

IGT now makes 93 percent of the world’s video poker machines and is the largest manufacturer of video slots in the world. Its Wheel of Fortune franchise spans every kind of slot machine — reels, curved screens, and massive installations with enormous physical flourishes. On my visit to their Las Vegas offices, I asked Jacob Lanning, IGT’s vice president of product management, what makes a good game. 'If you can figure that out, you’ve got a job,' he said. Trask had told me something similar: 'If we knew what the perfect game was, we’d just keep making that game over and over.'

Perhaps no one has uncovered the Platonic ideal of the slot machine, but certain principles undergird most games. First, there’s a vague aesthetic uniformity: colors tend toward the primary or pastel, franchise tie-ins are a must, and the game soundtracks are typically in a major key. Meanwhile, the multi-line wins introduced by Bally have become an unintelligible tangle: modern slots offer players upwards of 50 and sometimes 100 different winning combinations — so many that without the corresponding lights, sounds, and celebration, most casual and even advanced players would have trouble recognizing whether they’d won or lost.

To keep players gambling, all slots rely on the same basic psychological principles discovered by B.F. Skinner in the 1960s. Skinner is famous for an experiment in which he put pigeons in a box that gave them a pellet of food when they pressed a lever. But when Skinner altered the box so that pellets came out on random presses — a system dubbed variable ratio enforcement — the pigeons pressed the lever more often. Thus was born the Skinner box, which Skinner himself likened to a slot machine.

The Skinner box works by blending tension and release — the absence of a pellet after the lever is pressed creates expectation that finds release via reward. Too little reward and the animal becomes frustrated and stops trying; too much and it won’t push the lever as often.

Like video poker, most multi-line slots rarely pay large jackpots, instead doling out smaller wins frequently. 'They’re imitating the formula of video poker, but they’re doing it in a slot formula,' Natasha Schüll, an associate professor at MIT who has researched slots for 15 years, says. In 2012, Princeton University Press published Addiction by Design: Machine Gaming in Las Vegas, the culmination of her research and a deconstruction of the slot machine.

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Schüll says modern slot machines essentially continued the trend started by Redd so as not to jolt players too intensely in the form of losses — or wins. 'Too-big wins have been shown to stop play because it’s such an intense shift in the situation that you’ll kind of pause, you’ll stop, you’ll take your money and leave,' says Schüll. Stretching out gameplay with minor rewards, Schüll says, 'allows you to get in the flow of, another little win, another little win.'

As a result, modern slots pay out on approximately 45 percent of all spins, instead of the 3 percent of traditional slots. 'The sense of risk is completely dampened,' Schüll says. 'Designers call them drip feed games.'

That analysis is supported by a 2010 American Gaming Association white paper. 'Lower-volatility games often have greater appeal in 'locals markets' than in destination resort markets like Las Vegas or Atlantic City…Customers tend to play these games for longer periods of time…' In other words, lower volatility games paved the way for gaming’s wild expansion nationwide.

The advent of bonus games has also helped bolster slot machines’ popularity: instead of just winning money, certain combinations can trigger mini games. In the IGT showroom, Lanning showed me the company’s forthcoming Entourage game, in which a bonus game has the player match portraits of characters. In the industry, it’s called a pick-em bonus. 'Those are the most popular features,' Melissa Price, the senior vice president of gaming for Caesar’s Entertainment, told me. 'Customers enjoy ‘perceived skill’ experience.'

And then, there’s the emotional appeal: Price told me the company commissioned a study to find out why people love the Wheel of Fortune line so much. 'People said it was as much about the brand as anything,' she said. 'People said, ‘That brand — I used to hear it in the living room at my grandma’s house, I’d hear that wheel spinning because my grandma watched it. It reminds me of my grandma.’ I mean, how can you compete with that?'

Price and I spoke on the floor of Harrah’s Las Vegas at 9:00AM — the slots players were already at their machines, or perhaps they’d been there all night. Last year, Harrah’s parent company, Caesar’s Entertainment, declared bankruptcy as a consequence of overextension and growing competition. During proceedings, creditors appraised Caesar’s vast store of customer data as the company’s most valuable asset, worth about $1 billion.

Harrah’s pioneered the now industry standard Total Rewards player tracking system, first with a punchcard program introduced in 1985, then with a digital program and magnetic cards in the 1990s. Slots were easy to track, and stood at the very center of the program. The system grew even more sophisticated under the auspices of former CEO Gary Loveman. Loveman arrived at Harrah’s fresh from teaching at Harvard Business School, and he brought a methodical business savvy to an industry that, in many ways, had spent decades winging it.

Before the tracking system, the player management was as sophisticated as watching which players spent a lot of money and comping amenities to encourage them to spend more. 'We all looked around and said, there’s got to be a more automated way to do that,' said Price.

Price and I stood behind a woman playing IGT’s Ellen Degeneres game. Ellen’s head whizzed down the reels on the parabolic display in high definition. As long as the player had her Total Rewards card inserted in the machine, every time she hit the spin button the system recorded the size of her bet, what game it was spent on, at what time, how long she’d been playing for, and so on, until she hits the 'Cash Out' button on the machine, at which point all the data is encapsulated in her file, along with all the other games she has ever played at a Caesar’s casino.

Player tracking systems revealed more than a pit boss ever could: over time, Harrah’s can create a portrait of the person’s risk profile, including how much money a player typically loses before they stop playing and what kinds of gifts to give them to keep them on the gaming floor. Sometimes, that can be a penthouse suite; other times, it can be as little as giving a player $15 in cash. In 2012, This American Life charted the lurid and unsettling extreme of how these systems can be used in a story about a Harrah’s in Indiana that enticed a woman to keep playing with unlimited hotel suites, diamond jewelry, and free trips to the Kentucky Derby. The perks fueled her gaming habit until she was $125,000 in debt.

Every casino today has a form of the data system invented at Harrah’s — most of them are now built by Bally. 'We are the envy of probably every consumer products industry out there because of the amount of data that we really have on our players,' said Price. Newer systems can even visualize heat maps of casino activity — an operator can see precisely how much is being spent in a specific time period in localized areas.

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The data also vindicates Redd’s approach: the small slots customer, over a lifetime of spending, is just as valuable as the high roller. 'The slot player was the forgotten customer,' Loveman told Bloomberg BusinessWeek in 2010. 'I had to be willing to be unsexy in this,' Loveman added. 'I can take you to a casino that would have a lot of young beautiful people in there and you would say, ‘Man, this is a happening place.’ I could take you to another place where there are a lot of people who look like your parents. The latter would be a lot more profitable than the former. My job is to make the latter.'

After my trip to Vegas, I visited the Sugarhouse casino in Philadelphia, on the bank of the Delaware River. Sugarhouse opened in 2010 and is one of 12 casinos that turned Pennsylvania into a gaming powerhouse after legalization in 2004. The casino’s interior — clear passageways, a clean line of sight from the eastern to western walls — brimmed with activity on a Tuesday evening. Sugarhouse squealed with the cacophony of slots and the saccharine melodies sounded like a thousand robots blowing bubbles. (The slot manufacturer Silicon Gaming decided at one point that soundtracks in the key of C were the most agreeable.)

In 11 years of legalized gaming, the state has earned $3 billion from table games and $17 billion from slots. Table players at Sugarhouse made their wagers at an island amidst an ocean of slots. As I made my way through the casino, I struck up a conversation with two slot players: Diane Singleton, a 45-year-old retiree; and Jack, who refused have his last name published. The two were playing Fu Dao Le, whose theme can only be described as Cherubic Chinese Babies. The game was loaded onto a ProWave cabinet, and a red cursive Bally logo hung in the upper right corner of the screen.

I asked what they enjoyed about the game. Jack said that unlike other games, Fu Dao Le is 'highly interactive.' He likes the game’s 'kooky stuff; you can touch the display,' he said, touching the image of cherubic babies above the reels, causing them to laugh with a Pillsbury Doughboy-like giggle.

Jack and Singleton say they’ve both earned 'Black Cards' through Sugarhouse’s player tracking system, meaning they’ve each spent more than $10,000 here. Jack says the casino has comped them four cruises so far; Singleton says she threw her card away because it reminded her of how much money she’d spent. I had more questions, but at a certain point it became apparent that Singleton was no longer listening.

'She’s in the zone right now,' said Jack.

The 'zone' is at the core of Schüll’s theory about the success and proliferation of slot machines. She heard the term over and over again in her 15 years of research — the players repeatedly told her that they played to zone out, to escape thought.

To understand the zone, you first have to understand 'flow,' the concept developed by Hungarian psychologist Mihaly Csikszentmihalyi to describe a hyperfocused state of absorption. During 'flow,' time speeds up (hours feel like minutes) or slows down (reactions can be made instantly) and the mind reaches a state of almost euphoric equilibrium. Schüll, in her book, describes Csikszentmihaly’s four criteria of flow: '[F]irst, each moment of the activity must have a little goal; second, the rules for attaining that goal must be clear; third, the activity must give immediate feedback; fourth, the tasks of the activity must be matched with challenge.' For most of their history, slots easily fulfilled the first two criteria; after lowering volatility, they fulfilled the third criterion, and with the introduction of multiple lines, endless bonus rounds, and the occasional mini-game, they finally fulfilled the four criteria.

The 'zone' is flow through a lens darkly: hyperfocused, neurotransmitters abuzz, but directed toward a numbness with no goal in particular. When Singleton emerged from the zone, I asked her again why she found the slots so compelling. 'I lost my husband two years ago to throat cancer,' she explained. 'He was the love of my life, and I started doing this just to — I was out of my mind and spent a lot of time at the cancer center.' Jack had lost his son to pancreatic cancer. As they told their stories, Jack and Singleton hit the spin buttons and the machines blared so loudly that their words were lost in the noise.

Singleton says she never recovered from the pain of her loss, and that’s why she keeps coming back to the slots. Jack echoed that sentiment: 'I don’t have to think. And I know I can’t win.'

'Right, so you know that,' said Singleton.

'Every now and then…you get something,' Jack agreed.

'But it’s never what you lost.'

'Because I don’t care whether I win 38 cents or 600 dollars.'

'You just want to see them again.'

Singleton rifled through her wallet filled with $100 bills. 'I’ll be right back, guys,' she said, and went off to get change.

Back at the Bally showroom, Trask and I had sat in front of the company’s new Duck Dynasty game. 'There’s never been more slot machines in the world than there are today,' he said. 'And that’s proliferation not just in the US, but abroad.' His hand rested on the game’s display, his index finger next to a reel symbol of a cast member sticking his tongue out and playing air guitar. Scientific Games’ market now includes 50 countries on six continents. This spring, the company announced it was planning on providing 5,000 of the 16,500 machines recently authorized in Greece.

The industry is also preparing for the eventual deterioration of its key middle-aged demographic and competition from free-to-play mobile games. 'People only have so much leisure time and there’s a lot of activity on iPhones,' Price told me. At one point in the Bally’s warehouse, Trask said, 'You know how you get people younger to gamble? Hand them a fucking telephone.'

The industry seems to be working on the same hunch. In 2011, Caesar’s acquired Playtika, an online casino games company that offers free and paid mobile games. A year later, IGT acquired the free casino games app DoubleDown, which runs as both a stand-alone mobile app and through Facebook. The company now offers online table games and a good sample of its portfolio of slots, including Wheel of Fortune, to mobile players. Earlier this year, the gaming giant appointed former Zynga studio manager Jim Veevart as DoubleDown’s vice president of games. And last year, Churchill Downs Incorporated, which runs seven casinos in addition to its Kentucky Derby racetrack, acquired the free games company Big Fish Games.

Meanwhile, the tech sector is adopting the principles of slot design for its own purposes. In the early aughts, the tech writer Julian Dibbell devised the concept of ludocapitalism, a term inspired by watching World of Warcraft players mine gold in the game to making a living in real life. Ludocapitalism was an attempt to explain the growing gamification of society through technology. Dibbell admits the concept’s parameters are vague, but at its most basic it identifies that capitalism can harness the human play drive for better or worse — and that increasingly, games aren’t allegories that say something about our lives; they are our lives. As people move toward more Schüll says. Writing in The Atlantic, Alexis Madrigal tapped Schüll’s concept of the ludic loop to explain the inextricable entrancement of flipping through Facebook photos: you push a button over and over, primed for an eternally fleeting informational reward.

A more exact replica of a slot may be Tinder. The mechanics of the dating app mirror the experience of playing slots: the quick swiping results in an intermittent reward of connection, followed by the option to either message your potential date or 'Keep playing.' Tinder recently launched a premium version that allows the user to undo an accidental 'not interested' swipe, essentially monetizing mistakes made while in the automatic rhythm of the zone.

'I can’t tell you how often I’ve been approached since the publication of my book by Silicon Valley types who say things like, ‘Wow, the gambling industry really seems to have a handle on this attention retention problem that we’re all facing,' Schüll told me. 'Will you come tell our designers how to do a better job?’'

Last year, Schüll heard from Nir Eyal, a tech entrepreneur who founded and sold two startup companies that produce advertisements in free-to-play games. '[Eyal] showed me his copy of my book, and it had, like, hundreds of hot pink sticky notes coming out of it,' she told me. In his 2014 book Hooked: How to Build Habit Forming Products, Eyal laid out his 'Hook Model' of product development that works on basic behaviorist principles: a trigger turns into an action turns into a variable reward turns into a further personal investment back into the product. Last year, he invited Schüll to speak at his Habit Summit, hosted at Stanford. Schüll gave a talk on the 'dark side of habits,' placing slot machines on the undesirable end of the habit spectrum.

Eyal told me he invited Schüll to offer a less self-congratulatory, 'rah-rah' voice to the conference. Although the conference focused on how to build habit-forming tech products, 'These techniques — they have a dark side,' he said. 'If not used appropriately, or if used for nefarious purposes, then they don’t always benefit the user.'

Still, it was difficult to determine whether Schüll’s slot research has been received as a warning or a how-to guide within tech. Eyal criticized slot machines for what he said was a business model dependent on addicted players — 'that industry, I have a problem with,' he said. But Hooked is in many ways tech’s version of Addiction by Design: his model of successful product design is a loop going from 'trigger' to 'action' to 'variable reward' to 'investment' and back again. In his trigger section, Eyal uses Instagram to illustrate how emotional pain can be a powerful motivator to use a product — in that app’s case, the mostly insubstantial pain of lost memories. He writes, 'As product designers it is our goal to solve these problems and eliminate pain…users who find a product that alleviates their pain will form strong, positive associations with the product over time.'

I asked Eyal what distinguishes mobile games or dating apps from slot machines. He gave a range of answers that sounded at once comprehensive and somewhat defensive — that tech addictions never really plummet to the league of gambling addiction; that people prone to addiction will be addicted no matter what — before finally admitting that, in a sense, everything functions like a slot machine.

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'All content needs to be made interesting. What you’re doing as a writer is introducing variable rewards into your story. Everything that engages us, all pieces of content are engineered to be interesting,' he said. 'Movies aren’t real life, books aren’t real life, your article isn’t real life. It’s manufactured to pull us one sentence after another through mystery, through the unknown. It’s a slot machine. Your article is a slot machine. It has to be variable. So just because an experience introduces variability and mystery — that’s good!'

'I think the answer is, it’s okay to addict people as long as your business model doesn’t depend on it,' he said, as if finally finding the answer to a problem that had long seemed without a solution. 'That’s the answer,' he added. 'That’s the answer.'

Correction: a previous version of this article stated that modern slots have a 45 percent payback rate. In fact, they pay out on approximately 45 percent of all spins. In addition Nir Eyal's Hooked was published in 2014, not 2003.

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Photography by Tiffany Brown Anderson

Edited by Michael Zelenko

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