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The Same Color Illusion

Image Credit: Edward H. Adelson, Wikipedia

https://apod.nasa.gov/apod/ap231218.html #APOD

A checkerboard is shown with squares colored light and dark grey. A green tube sits on the board and casts a shadow. The image has a letter A typed on a dark square, and a letter B types on a light square cast in shadow. The question is asked if the two squares, A and B, are really the same color.

APOD: 2023 December 18 – The Same Color Illusion

A different astronomy and space science related image is featured each day, along with a brief explanation.
apod.nasa.gov
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MegatronicThronBanks
MegatronicThronBanks
• •
They're really not. I think the mobile image compression @$$@##'d something.
This entry was edited (11 months ago)
in reply to (moving) APOD

John Krantz
John Krantz
• •
ok, there are illusions but they are not arbitrary as your discussion implies. I your example, the brightness, not color, illusion is due to the surrounding intensities and how the visual system emphasizes relative ove absolute intensity. Necessary as most objects only reflect light and relative intensity is what is more important than absolute intensity. So this illusion illustrates a visual strength not weakness.

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