Absolutely beautiful dance of a liquid droplet. In scientific terms, an ultrasonic field is used to levitate a drop of liquid. Increasing and decreasing the strength of the field alters the droplet’s shape. Here is the scientific paper: “Shape oscillation of a levitated drop in an acoustic field,” by W. Ran & S. Fredericks (Clemson University, Department of Mechanical Engineering)” (Thanks, Ariel Waldman!)