A New Depth-Rescaling Illusion

Most visual illusions are produced using carefully contrived drawings or gadgets to fool the visual system into thinking impossible things.  As described in an earlier post, while waiting at a train station, I encountered an apparently real-life Ponzo illusion. Here I explain why I think the new illusion is more strange and more interesting thanContinue reading “A New Depth-Rescaling Illusion”

Uri Geller: Self-Proclaimed ‘Psychic’

A flash-back to 1975 when Uri Geller came to town.  Super-psychic or super-charlatan? Who to Believe? On the one hand, a scientific report published in Nature verifying Geller’s psychic abilities under supposedly cheat-proof conditions, and on the other, a highly speculative but critical attack published simultaneously in New Scientist. While Targ and Puthoff’s reply …Continue reading “Uri Geller: Self-Proclaimed ‘Psychic’”

A New Ponzo Illusion (or something more?)

Most visual illusions are produced using carefully contrived drawings or gadgets to fool the visual system into thinking impossible things.  Recently,  waiting at a train station, I encountered a real-life Ponzo illusion. The Illusion The traditional form of the Ponzo illusion is produced by drawing a pair of receding railway lines. The context suggests differentContinue reading “A New Ponzo Illusion (or something more?)”

The Strange Self-Motion Illusion

Anomalous experiences tend to jolt one out of one’s comfort zone, tell us interesting things about how the mind works.  A vivid déjà vu, strange coincidence, or unexpected illusion can all be automatic attention-grabbers.  Some of the oddest experiences are visual. When a large part of the visual field moves, the viewer can momentarily believeContinue reading “The Strange Self-Motion Illusion”