As you know, this picture was taken as a single shot, it looks this way without any photoshopping at all, except for the frame and copyright.
Here’s how it was taken. I was up in Logan at a math conference, and the building we were in had a lot of mirrored glass.
When I stood right outside the door, at just the right spot looking in just the right direction, the glass was at a 45° angle and reflected the building to the right of me as if it were directly in front of me.
The building on the left side of the picture is actually a reflection, the greenhouse on the right side is what was really right in front of me.
So, that’s the trick. And like any good magic trick, it simply took framing the picture so that you couldn’t see any clues to what was really happening.