Hanging Pictures

Anyone who’s ever hung frames on a wall knows that if you want it to look right you need to do some math. And you also know that the multi-packs of frames you get at discount stores belong in a dumpster.  The frames fall apart, the hangers are a pain to get on the wall, etc.  Have you ever tried to put a half dozen frames of different sizes up a stairway, so that they look even and lined up?  It’s a pain.  Yes, I will get the frames on the wall.  No, I can’t just put a hole in the wall and flop them up there.  It takes maths.  Not calculus, but still maths..