How an ice labyrinth works ;) (you tube video of prank (not mine)

A janitor`s prank:

http://www.youtube.com/watch?v=n74VsnC3u-E

The janitor`s artfull labyrinth has all the main elements a proper one requires:
- dimension in space (requiring time to cross it)
- no easy escape (or with the penalty of wet feet;)
- redundant elements, reconnecting paths
- two or three traps ;), eg. a circle to reverse the walkers course, intersection and luring pathes.

Great job  ;)

Enjoy: