The Guardian – Alex Bellos
“Today’s puzzles are four optical illusions devised by the magician Matt Pritchard. He calls them ‘perspec-tricks’. Each image is a photograph that seems to show something impossible. The puzzle is to work out exactly how Matt created the illusion. The magic he used is old school: none of the photographs has been digitally modified. What you see is exactly what the camera saw. All the illusions involve mirrors in some way.” (more)