Why hang up multiple shelves for keys, knick knacks and whatever else, when you can combine them all into one supershelf? Dubbed the "Mexican Army Shelf", this multi-faceted shelf concept attempts to answer that question.

Designed by students at Ludens, a Mexican design school, the shelf has about 4 layers, which reveal places to hang clothing, store coins, write notes or stash your keys. There are even fold out sections that reveal a mirror and cupholders. This is clearly still a concept, and while it seems neat, I could also see this thing getting chaotic if you tried to use it for too many things at once. [Ludens via The Design Blog via Craziest Gadgets]