Liquid metal. The picture is turned into a rippling chrome surface that has almost nothing to do with the original colours.
Brightness is read as a height field, and then the surface distorts itself: the slope at each point is used to shift where that point reads from, which is a cheap imitation of light refracting through an uneven surface, and is what makes the metal look like it is flowing rather than merely bumpy.
The chrome look comes from the tone curve. The height is fed through a wave, so instead of a smooth gradient you get alternating light and dark bands, which the eye reads as reflections of an environment. A small extra term makes their spacing slightly irregular so they do not look mechanical, and a narrow boost adds a hard highlight on the peaks only.
detail sets how many bands, distortion how much the surface flows.