but IKEA's new two-in-one BILLY model features the same 31.5-inch-wide minimalist bookcase you know and love, plus it comes with a retractable desk and removable drawer front. The table portion ...

Because many of them are compact enough to fit into a bookshelf. You can also place them in a corner or even on your desk (depending on size), but a bookshelf isn't necessarily where you should put ...