Generating lines, shapes of increasing complexity and testing against experience.
EYE AND BRAIN
The painter invents coloured shapes which may or may not match the image in the viewfinder.
Tracing a flat pattern.
TRACING
The painter, viewing through a perspective frame, traces parts of the image-in-the-viewfinder which he considers to be significant.
A mechanical device records a flat pattern.
AUTOMATIC
The photographer presses a button so that a recording device copies what appears in the viewfinder – matching it perfectly (within technical limitations).