Escher Warp
Turn a picture that contains a smaller copy of itself into the endless spiral from Escher's Print Gallery. On the left, drag the blue rectangle onto the shrunk copy inside the picture; the right side shows the twist. Use the controls to zoom, animate, and toggle the twist — or upload your own self-similar image. Based on 3Blue1Brown's video “How (and why) to take a logarithm of an image.”