Thomas Steinke @stein.ke · Apr 19 There are also rod cells in your retina. In principle these give you a 4th dimension for perceiving colour. But they are for peripheral & night vision, so we don't perceive a 4th color dimension. 🤷
4 likes 1 replies
?
Replies
The reason I got interested in this is that I didn't understand why red plus blue makes violet/purple. Violet corresponds to the shortest visible wavelengths -- shorter than both blue and red. The explanation is that the S/red cone cells are also activated by short wavelengths for some reason.