A good man may fall, but he falls like a ball [and rebounds]; the ignoble man falls like a lump of clay.
You begin by engaging the left hemisphere of the brain with the overall shape, the basic structure of the painting, and then eventually you engage with the colour, with the mood of the painting and then you are entering the activities of the right hemisphere - and it is in the right hemisphere that ideas of space are born, the realization that you are seeing space.