The BILLY bookcase is a legend. One of IKEA's signature products, BILLY models remain in the company's catalog year after year - and it even has its own entry on Wikipedia. Many people love it; in ...

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That might be true, but it doesn’t describe the Billy bookshelves, which have adjustable shelves, not fixed, and are about 10.5 inches deep, after the shelves are assembled.

She said one of the most popular IKEA hacks they use are customizing rooms with the Billy shelves. "They’ve been around since 1979," she said. "It's completely versatile.