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In the Theravada tradition, there is a list of 38 objects of meditation. In them, there are 3 colors: Blue-Green, Yellow, Red. This is not what I'd expect if these three colors are picked in a way which is based on a basic neurological phenomena.
Can anyone point me to classical references detailing experiences and meditative observation on the nature of color observation?
The most colorful sutta is MN77 Mahāsakuludāyisutta.
Not perceiving form internally, someone sees visions externally, blue, with blue color, blue hue, and blue tint.
Not perceiving form internally, someone sees visions externally that are yellow, with yellow color, yellow hue, and yellow tint
Not perceiving form internally, someone sees visions externally that are red, with red color, red hue, and red tint.
Not perceiving form internally, someone sees visions externally that are white, with white color, white hue, and white tint.
(etc.)
AN10.29 is the second most colorful sutta.
There is what is termed the Fire Kasina which is mentioned in the path of purification or Visuddhimagga.
There's a fascinating site where people document there experiences with many types of mental visualisations.
