/ic/ - Artwork/Critique

I was thinking of drawing a stack of blocks in perspective like this, but I had a hard time figuring it all out.

I decided to look up a reference picture and now I am even more confused. I thought each block would have its own set of vanishing points, but each of them would meet on the same horizon.

According to this picture I measured, the lines seem to be going every direction conceivable and not meeting at a common horizon line.

Am I retarded? What's the trick here?