As described in Douglas Hofstadter’s book ‘Godel, Escher, Bach’, this is what happens when you connect your camera to your TV and point the camera at the screen. The spirals are created by tilting the camera.
Source: https://inv.nadeko.net/watch?v=Y-gqMTt3IUg
I’m currently reading this article here which links to the video. The article is about a zip file that contains itself.
I used to entertain my kid with this. Have them stand between the camera and the display and they can amuse themselves for a (relatively) long time.