Photograph of the results of a drop of water falling into a liquid. Transverse waves are produced by the drop penetrating the surface of the liquid. The water drop is displaced, forming first a crater with a coronet around its sides, then a column (shown here) as the coronet collapses & the water rushes in to fill the crater. The column rapidly becomes unstable. As it sinks beneath its own weight, small droplets of water may break away from its tip.