By the way, a movie is contained on a number of reels and the projectionist knows when to start the next projector when he/she sees a black or red spot in the upper right hand corner of the screen - first there is one spot, count to 10, the second spot, and hit the button on the next projector. The spots also generally signal a total sound and scene change, which is fun to spot in advance. And since a director has to end a scene on the second spot in a sequence, only 10 seconds to finish a scene after the first spot, because of the reel change, you can catch a bit of the pace and directors art by following the spots.
Either a person can see those spots or they can't. They are designed to be unobtrusive but I can't miss them. Tried to show them to some people and they never saw them, thought I was making it up. I taught Gage how to spot the spots during Harry Potter tonight, and damn he caught on! He actually caught two before I did! More proof that he is my grandchild and will grow up to be as an obsessed fool with trivial knowledge as I am. But what the hell, it is fun him and I high fiving whenever we see the spots and having others in the audience wonder what in the world we are doing... Vince