@foerterer@mastoart.social The trick with multiple holes is to split up the generated image on the screen to make multiple projectors, so it doesn't have to do it one at a time (by trading off some of the resolution of the panel). If you were to watch the screen in slow motion, you would see little fish-eye regions scrolling past in sync with the holes in the drum. (and in fact you can sort of see that at the end of this video https://mastodon.social/@ancientjames/116338945925889785 )