Full Idea
The way in which people react to a geometrical diagram or anything like that is unmistakable proof of the theory of recollection.
Gist of Idea
People are obviously recollecting when they react to a geometrical diagram
Source
Plato (Phaedo [c.374 BCE], 073a)
Book Reference
Plato: 'The Last Days of Socrates', ed/tr. Tredennick,Hugh [Penguin 1969], p.121