Perception and Ideation
Monks, there are these six (types of) perceptions: perception of form, of sound, of smell, of taste, of touch, and of ideas.
"One perceives, one perceives", it is said, my friend, therefore it is called "perception". And what does one perceive? One perceives blue, one perceives yellow, one perceives red, one perceives white.
Sanna means about the same as the German "Vorstellung". i e the mental image produced either by direct perception of an object or in the act of remembering or imagining it. The English word "idea" is sometimes used to cover both. In this text, saIDia: is described mainly as perception, but among the perceptions are also counted the objects of the internal sense, ~, namely dhamma; these are the memory images.