The foregoing is only a tentative beginning at such a terminology. But we can borrow from the terminology of the physicist only with greater caution since he is describing energy and we are describing information. The four types of structure listed are surely not exhaustive. Their virtue is that they are intended to be capable of mathematical treatment but not a blind analytical treatment. They also may serve to clear up misconceptions such as the notion that visual perception rests in the seeing of forms made up of lines or outlines.
Animals see all kinds of things besides forms.
The seeing of colors is not necessary for vision, nor is the seeing of brightnesses for that matter, but the detection of structure is.