by Buttered ToastWell, I'm not sure. I did try covering one side at a time. But, I wonder if it is a shadow position, which makes the bottom left indicate a contrary light source to my eyes. And, I am not a visual artist of any sort...I can't draw that great, even. But the play of perspective seems to make the top left piece indicate distance through shortening that side. I dunno... That shit hypnotises me, even though I am immune to human hypnotism.
Yep, they are great contemplative pieces, aren't they?
"Those staircases are "islands of certainty" upon which we base our interpretation of the overall picture. Having once identified them, we try to extend our understanding, by seeking to establish the relationship which they bear to one another. At that stage, we encounter trouble. But if we attempted to backtrack - that is, to question the "islands of certainty" - we would also encounter trouble, of another sort. There's no way of backtracking and "undeciding" that they are staircases. They are not fishes, or whip or hands - they are just staircases.
So we are forced, by the hierarchical nature of our perceptive processes, to see either a crazy world or just a bunch of pointless lines. A similar analysis could be made of dozens of Escher pictures, which rely heavily upon the recognition of certain basic forms, which are then put together in nonstandard ways; and by the time the observer sees the paradox on a high level, it is too late - he can't go back and change his mind about how to interpret the lower-level objects.
The difference between an Escher drawing and non-Euclidean geometry is that in the latter, comprehensible interpretations can be found for the undefined terms, resulting in a comprehensible total system, whereas for the former, the end result is not reconcilable with one's conception of the world, no matter how long one stares at the pictures. Of course, one can still manufacture hypothetic worlds, in which Escherian events can happen ... but in such worlds, the laws of biology, physics, mathematics, or even logic will be violated on one level, while simultaneously being obeyed on another, which makes them extremely weird worlds." (Etc.)
http://www.physixfan.com/wp-content/files/GEBen.pdf