From Cupcakes to a Musical Instrument Room, Step Inside the Dropbox Office At its San Francisco-based headquarters, the Dropbox culture is all about collaboration and a playful work culture.

Since its launch in 2007, cloud-storage service Dropbox has made in-office collaboration a breeze for millions of businesses across the country, and that spirit of teamwork radiates throughout the 1,500-person company's San Francisco headquarters. The space, designed by Rapt Studio, features a chic library, designated brainstorm areas, a rec room full of musical instruments and a massive commissary serving up delicious food -- with an emphasis on cupcakes. In fact, "cupcake" doubles as an official company value, one that signifies a playful work culture. And they don't mess around: One quick tour through the ultra-collaborative space and you'll witness so much "cupcake," you'll leave with a toothache.

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Mark Smith