I Don't Know What I Mean by Cigarette Burns

In the sort of upper right hand corner I saw a large orange disc and I didn't know what those meant. A tour guide suggested to me that there was some catechitical meaning to the discs which stuck in my mind so I wanted to know more about it. They were just discs ink blots yeah they were circular like cigarette burns in the in the old film reels if if you will. When you when you would watch a film on film in an old projection style  you would see these little circles in the top right hand is and they told you when it changed, yes exactly real markers.