An optical illusion depicting squares A and B on a checkered board, appearing different colors due to shadowing, but are actually the same shade. A green cylinder casts a shadow over the board. This illustrates how human perception can be misleading, mirroring similar biases in astronomical observation. The advent of technology like CCDs has reduced these errors but not eliminated them.
Astronomy Picture from 17/07/2007
The Same Color Illusion
Source: https://apod.nasa.gov/apod/ap070717.html
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