What's more awesome than a Klein bottle? Why, three Klein bottles inside (outside?) one another! Here's the glass sculpture by Alan Bennett for the Science Museum in London:
It consists of three Klein bottles, one inside another. A Klein bottle is a surface which has no edges, no outside or inside and cannot properly be constructed in three dimensions. In the series Alan Bennett made Klein bottles analogous to Mobius strips with odd numbers of twists greater than one.
Link - via Mad Rabbit, Dead Hare