I made myself a camera obscura helmet. Thats right, a wearable 17 inch focal length camera obscura. It is made out of thin plywood, a cloth neck cinch, Duralar and acrylic focusing screen, and your head fits comfortably into an attached skateboard helmet. You can walk around with it on your head and see the world upside down.
There is something about seeing someone walk around with a box on their head that makes me smile.