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Comment by Symbiote | Hacker News Reader

Hue is a circle mapped to a rainbow.

  0° red
  60° yellow
  120° green
  180° cyan
  240° blue
  300° magenta

You can see your red, green and blue every 120°.

Labelled colour wheel:

http://codropspz.tympanus.netdna-cdn.com/codrops/wp-content/...

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That's a good way to put it.

Tangential, but does anyone else see movement near center of the color wheel when changing focus away from it? Optical illusions fascinate me. Are certain types categorized?

No, I didn't notice the movement you describe. But the color wheel's content appears to grow and shrink the slightest bit when I move my head towards it and away from it, respectively. Probably a halo effect.

Looks like there are some recognized categories:

>3 Explanation of cognitive illusions > 3.1 Perceptual organization > 3.2 Depth and motion perception > 3.3 Color and brightness constancies > 3.4 Object > 3.5 Future perception

https://en.wikipedia.org/wiki/Optical_illusion

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