First, you tear down the walls and dispense with the soulless cubicles. Then you put everyone at long tables, shoulder to shoulder, so that they can talk more easily. Ditch any remaining private offices, which only enforce the idea that some people are better than others, and seat your most senior employees in the mix. People will collaborate. Ideas will spark. Outsiders will look at your office and think, This place has energy. Your staff will be more productive. Your company will create products unlike any the world has ever seen.

That is the myth of the open office, a workplace layout so pervasive that its presence is taken for granted, and its promises–of collaboration and innovation–are sacrosanct. According to a 2010 study by the International Facility Management Association, 68% of people worked in an office with either no walls or low walls–and the number has undoubtedly grown.

There’s just one problem. Employees hate open offices. They’re distracting. They’re loud. There’s often little privacy. “The sensory overload that comes with open-office plans gets to a point where I can barely function,” says one 47-year-old graphic designer who has spent more than two decades working in open environments. “I even had to quit a job once because of it.”

For as long as these floor plans have been in vogue, studies have debunked their benefits. Researchers have shown that people in open offices take nearly two-thirds more sick leave and report greater unhappiness, more stress, and less productivity than those with more privacy. A 2018 study by Harvard Business School found that open offices reduce face-to-face interaction by about 70% and increase email and messaging by roughly 50%, shattering the notion that they make workers collaborative. (They’re even subtly sexist.) And yet, the open plan persists–too symbolically powerful (and cheap) for many companies to abandon.

As with so many things today, we have Google, at least in part, to thank. Open floors have existed since the secretarial pools of the 1940s, but when the then seven-year-old Google renovated its headquarters in Mountain View, California, in 2005, the lofty, light-filled result was more than a showcase for the company’s growing wealth and influence; it signaled the dawn of a new professional era. Architect Clive Wilkinson eschewed the cubicle-heavy interiors of the company’s previous office for something that resembled a neighborhood: There were still some private spaces, but also lots of communal workplaces and small, glassed-in meeting rooms. “The attitude was: We’re inventing a new world, why do we need the old world?” Wilkinson says. With Google’s rise, his vision for a collaborative workplace took off. “We had [companies] come to us and say, ‘We want to be like Google.’ They were less sure about their own identity, but they were sure they wanted to be like Google.”

Around the same time, a more radical version of the open office was emerging from other startups founded during the dotcom boom of the late ’90s. As these companies proliferated, they looked for cheap ways to differentiate themselves from each other and their predecessors. They found inspiration, Wilkinson says, in the more playful offices that had long been common in the advertising industry. Some moved into the unfinished lofts of San Francisco’s South of Market district–and left them that way. Walls only make things complicated when you’re rapidly adding (and eliminating) staff. “Those places were terrible,” says Joel Spolsky, who cofounded Fog Creek Software in 2000 and is currently the cofounder and CEO of Stack Overflow. “They were so loud, because there were no drop ceilings. It was painful for everybody. But [dotcom startups] were doing it because they had literally no choice.” Out of necessity, an aesthetic was born.

By the time Facebook opened its Frank Gehry–designed Menlo Park headquarters in 2015, the open office had become not just the face of innovation in Silicon Valley but a powerful metaphor. Facebook now houses roughly 2,800 employees in a 10-acre building that the company claims is the largest open floor plan in the world. “The idea is to make the perfect engineering space: one giant room that fits thousands of people, all close enough to collaborate together,” founder and CEO Mark Zuckerberg wrote when he announced the design in 2012. Famously, he has a plain white desk in the communal area, just like everyone else. (He also has a private “conference” room, where he is rumored to spend much of his time.)