William Horatio Bates, Perfect Sight Without Glasses… (1920)
“ In one case a patient who saw grey so vividly when she palmed that she was positive she saw it with her eyes, instead of merely imagining it, was able to obliterate nearly all of it by first imagining a black C on the grey field, then two black C's, and finally a multitude of overlapping C's.It is impossible to remember black perfectly when it is not seen perfectly. If one sees it imperfectly, the best one can do is to remember it imperfectly. ”
