> Why do line drawings work? Why is it that we can immediately recognize objects in line drawings, even though they are not a phenomenon from our natural world.

> Why do line drawings work? Why is it that we can immediately recognize objects in line drawings, even though they are not a phenomenon from our natural world. This is wrong, as humans have been drawing and viewing art for tens of thousands of years. Also, for other animals, a form of edge detection is present in for example the tiger paw mark that a tiger leaves on the bark of a tree to mark territory, or simply paw/foot marks on the ground.