 |
 |
 |
A personal favourite optical illusion: this is a Penrose Tribar, a physical impossibility in the real world. This is at the Spectrum in Berlin, which is all about physics, vision, and sound. Unfortunately the camera couldn't shoot through the very tiny peephole set up for the human eye, so I had to shoot beside it and so you can see a slight flaw in the illusion if you look closely.
