Wow, they should have called it Optical Illusion Tower
OKAY, I think I finally figured it out. Thank you both of you.
So yes, the base is perpendicular to the ground, just the chamfered corners rise at an angle, adding to the enigmatic nature of the building.
The same goes for the main body - the four sides rising off of the base sides rise straight up at a perpendicular angle from the ground, forming a single continuous straight line from the ground all the way to the top - so if you're looking at the building from the "right" angle which is if you're directly facing one of the four BASE SIDES, you will see a perfectly rectangular structure. You'll see this:
However, if go to the side and face a CORNER, then you'll see a tampered structure - both the base will appear to be rising at slight angle, because of the chamfered corners, AND the main body will appear to be very tampered - the top will actually appear 50% smaller than the base.
And as you move from the side to the corner you'll get everything in between, from slightly to highly tampered. The pic that BStules and Blind_Guardian posted is a good example of it appearing slightly tampered from a slight angle. If you rotate it to the right a little bit it'll appear perfectly rectangular like the one I posted.
So, OKAY, I get all this. BUT, I'm still a little confused, because I've definitely come across renderings that are supposed to be of the final design, which appear very odd, and where the top square appears as big if not bigger than the base square. Here's an example:
(sorry I printscreened that one)
In this one, I don't know if it's the angle that's playing some sort of a crazy optical illusion on me again, but the chamfered side on top appears just as big, if not bigger than the base side, and also just as perpendicular to the ground, when it should be 50% smaller and tampered + on top of that the one next to it, which should be the same size, definitely appears much smaller...? It does, doesn't it? So the top really doesn't look like a square to me. Also, I really think I should be able to see more of the base, namely the left side on that rendering...?
I'm also pretty sure I've seen some renderings where the top looked as big as the bottom, and from certain angles it almost appeared bigger. I think those might have been earlier renderings where they thought they would have the top square rotated at 45 degrees, but still be the same size as the bottom (so they'd be juxtaposed and the same size if looked from above ), so the building would look rectangular from ALL angles, as all sides would rise straight up perpendicular to the ground. But then they decided to have the above square be 50% smaller and fit into the base one when rotated, so that's what they did. Can anyone confirm if this is at all correct? Maybe I'm wrong about that, maybe its just an optical illusion I saw again.
Well anyways, I think it would have made more sense to have both squares at the top and bottom be equal in size and have the structure appear rectangular from all angles - this way it would have been even more enigmatic IMO, and it would have physically had more space. A lot more actually.
I don't know, it's still the most enigmatic and mysterious tower I've seen. I think that's what they were going for, so mission accomplished.
Man, that was a long post...