> having it follow people as they walk past That reminds me of this amusing project [1] from 13 years ago. An artist had a sidewalk right next to his window. H

> having it follow people as they walk past That reminds me of this amusing project [1] from 13 years ago. An artist had a sidewalk right next to his window. He put a curtain on the window that was only wide enough to cover about 20% of the window, with a motorized system to move the curtain side to side. A camera and software would recognize when someone was passing by and rapidly move the curtain to block their view in and then move it with them as the passed by. https://www.youtube.com/watch?v=rKhbUjVyKIc https://www.youtube.com/watch?v=rKhbUjVyKIc