Posted: Aug 15, 2017 9:50 am
by DavidMcC
scott1328 wrote:Red cannot be an illusion, if an illusion is defined as "not what it seems," and "red" is defined to be a label the mind attaches to a particular class of sensations.

However, it can be an illusion if an object is made to reflect only red light purely because it is bathed only in red light, and not because of its overall reflectivity spectrum being biassed towards red.