A droplet is surfing on a vibrating liquid bath —Naresh Sampara, University of Nottingham

A millimeter-sized oil droplet can bounce on a vertically vibrated liquid bath for an unlimited time. It may couple to the surface wave it emits, leading to horizontal self-propulsion as an object called a walker. Its motion is captured optically with a Nikon camera while an LED light is illuminated through a diffuser (array of blue and yellow colour sheets).

https://fluids.ac.uk/files/03.2_Naresh_Sampara_Walker_02.1576076427.jpg