ABSTRACT
A research psychologist wrote that he “attached on a dark background at the level of my eyes a small round piece of white paper, to serve as a [fixation point]; and meanwhile I attached another to my right, at a distance of about two feet, but a little lower than the first in order that [its image] would fall on the optic nerve of my right eye, while I [kept] the left closed. I stood facing the first paper and moved away little by little, always keeping my right eye fixed on the first; and when I was about ten feet away, the second paper, which was nearly four inches [in diameter], completely disappeared.”
