"The illusion convinces you that you are looking at the outside of a complete can, when in fact you are looking an inverted internal segment of can with the top stuck on upside down. The eyes see the shape as curved outwards, when in fact it is curved inwards."
"As with the Necker cube, once you see the faces as sticking out (or in), it is very difficult to see them as sticking in (or out). The still images don't do this illusion justice. The video is quite remarkable. It is hard to believe your eyes."
"This illusion plays with lines of perspective. All you need to do is take pictures of the dinos at both a horizontal and a vertical angle."
"The three squares with writing on are not the outward faces. They are the inward faces!"
Olivier Redon, a French-American inventor, demonstrates five optical illusions that exploit how the human eye interprets visual information. Three illusions are based on the Necker cube principle, where two-dimensional images can be perceived in multiple ways. The can illusion uses inverted internal segments to appear as a complete external object. The Oh La La Box uses two X-shaped cardboard pieces that appear as a three-dimensional cube. The twin dinosaurs illusion employs perspective lines at different angles. The fragile portrait combines multiple subjects at varying distances. The transparent cube reverses the Necker cube concept by presenting inward faces as outward ones. Each illusion demonstrates how context, perspective, and spatial interpretation influence visual perception.
Read at www.theguardian.com
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