Completed Tower of Fundamental Obstacles

This is a square. Can you guess which spot that goes in? That's right, it goes in the square hole. And how about this rectangle? It goes in the square hole too. Up next, we've got this thin rectangle. Can you guess where that goes? That's right, it goes in the square hole. And up next, a cylinder. Hmm... I think that goes in.. the square hole. Now, we've also got this semi circle right here. Do you see a slot that would fit the semi circle? That's right, it's the square hole. Okay. Up next, the triangle. We know what hole that goes in, right? That's right, square hole. And up last, up next, we have the arch. You guessed it, it goes in the square hole.