They've placed several of them lined up against a window, which gives the appearance of built-ins, but you can move them around. You could even use them as extra seating too. We love that they placed padded cushions on top. Multi-functional pieces like this are a great solution to small space living. We're thinking they might look good stacked up on each other as well... $39.99 at IKEA.
[ image via BHG ]