Via NPR's Krulwich Wonders Blog:
You are standing in a park in New Zealand. You look up at the top of a
hill, and there, balanced on the ground, looking like it might catch a
breeze and blow away, is a gigantic, rumpled piece of paper.
Except
... one side of it, the underside, is ... not there. You can see the
sky, clouds, birds where there should be paper, so what is this?
Gibbs Farm
As you approach, you realize it is made of metal. It's a
sculpture, made of welded and painted steel that looks like a two
dimensional cartoon drawing of a three dimensional piece of paper ...
that
is three dimensional if you get close, but looks two dimensional if you stay at the bottom of the hill...
Gibbs Farm
...as you can see from these two-dimensional photographs of the
three-dimensional sculpture that looks like a two-dimensional cartoon
sitting on a three-dimensional hill — STOP!!! My head hurts....
...
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