Pepper's Ghost
https://gyazo.com/ac75f58b5ddc7fe5a26dc316f14adde2
https://www.scienceworld.ca/resource/peppers-ghost-hologram-illusion/
https://www.ontariosciencecentre.ca/media/1900/peppersghostillusion.pdf
https://www.twowaymirrors.com/peppers-ghost-illusion/