Tricking the eye... I suppose forced perspective falls into that category. Generally it is used for effects such as we often see on murals, with painted shadows and other effects that give the impression of three dimensionality.

It often blows my mind to think that our notion of cyclopian 'perspective' was as much a technological invention as an artistic one. Today it is held to be 'natural' after over 100 years of looking at the world through the camera lens.