Optical illusions

Davina Bristow has a few nice optical illusions in this Telegraph article.

Here’s one.

optical illusion

The faces of this cube are, in fact, the same colour. Davina suggests a way to confirm this by cutting holes in a bit of paper which hides the surroundings – on my Mac I used the Digital Color Meter utility which shows the top actually to be slightly lighter in this rendition. It’s the edges of the faces, and the appearance of a shadow, which causes us to deduce that the top is grey and the bottom white.

Thanks to Claes-Frederik for the link.

1 Comment

To confirm this one, I just put one finger horizontally to cover the joint between the two surfaces, and another to cover the left edge and squint, preferably with only one eye, and I see one very uniform shade of gray.

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