Can you hang a painting from two pegs, so that if you remove EITHER of the pegs, the painting will fall down?

Let's see if I can do this with ASCII art...

 
 
   /---------\ /----------\
  /  /--------X--------\   \
  |  | A     / \    B  |   |
  |  \------/   \------/   |
  |                        |
  |                        |
  |                        |
  ^                        V

Follow the wire from the left side, 
up over peg A, 
under around and over peg B,

over around and under peg A,
up over peg B,
down on the right side.

If either peg is removed, the loop 
opens up around the remaining peg and
the painting drops.

Posted by Erik O. on 2005-04-01 15:06:59