I am an aphant; I did a lot of acid in the '70s - now that I think back, I am not sure what the visuals were like (also have SDAM). That is the setup - I was in Paris many years ago and visited 'La Defense'. There was an exhibit of portraits that were ugly, really, really ugly until I looked away I saw (don't know what other word to use here) the actual painting; the artist used complementary colors on the canvas to fade those colors and allow the mind to perceive the other side of the complementary colors. Since I can not see images in my head, I have no idea how my brain produced the complementary images (I am new to aphantasia)