I may not be using the same imagery you are. My mental eye appears to work from something my real eye has seen. I can look at a drawing of a sine curve and later imagine it in my head. This is not the same as recalling the original curve I saw. I can toy with the curve in my head but I do not sit there and draw the line from point A to B. It just poofs into my mind’s eye.
well, you’d have to be decently well-trained in math to picture a sine curve that isn’t, say, a series of parabolas glued together.
I may not be using the same imagery you are. My mental eye appears to work from something my real eye has seen. I can look at a drawing of a sine curve and later imagine it in my head. This is not the same as recalling the original curve I saw. I can toy with the curve in my head but I do not sit there and draw the line from point A to B. It just poofs into my mind’s eye.