I don't know if you want a bookshelf that can accidentally kill your sleeping cat, but this has to be one of the most original concepts we've seen. Or prototypes, we should say; artist David Garcia actually built this, it's not a Photoshop job.

One place where this thing would never work is in my apartment--crooked floors coupled with the vibration of the subway would send it rolling all over the place. It'd be just like having hyperactive dogs, where you come home and brace yourself while turning the knob to see what they've destroyed this time.

via dvice