Arjen Goldschmidt has sent in what appears to be the best (proof-endorsed) color optical illusion I have seen up to date! Below examples showcase embedded lines of seemingly different colors. The reason they look different is because our brain judges the color of an object by comparing it to surrounding colors. So without us even knowing it, in first example, our brains compare the flowing red stripes to the yellow stripes, forcing us to think they are orange. The blue stripes make the red ones appear much darker -almost purple, even though they are exactly the same color! This is just one of the examples why you cannot trust what you see even with your own eyes. Next time someone swears they saw Jesus, UFO, or a ghost, show them this animation
3+Phots

Hue is one of the main properties of a color, defined technically as “the degree to which a stimulus can be described as similar to or different from stimuli that are described as red, green, blue, and yellow” (those beeing the unique hues). The other main correlatives of color appearance are colorfulness, chroma, saturation, lightness, and brightness.

In painting color theory, a hue refers to a pure color—one without tint or shade (added white or black pigment, respectively). A hue is also an element of the color wheel. Hues are first processed in the brain in areas in the extended V4 called globs.