Vibrated shear thickening fluids
See a movie (Windows and Linux version 4.0 MB).
See a movie (Macintosh version 28.0 MB).
Here's a link to a creative YouTube remix of the movie.
Patterns: Top view of a vibrated layer of cornstarch and of glass microspheres in water. Diameter is 9.4~cm. White corresponds to the highest points, and black to depressions that reach the container bottom. Right: holes without Faraday waves; Middle : holes with Faraday waves; & Left: delocalized state.
Onset of Delocalization: Side view of the first steps of a delocalizing hole in cornstarch. These photographs were taken every 0.9~s. Time increases from left to right and top to bottom. An initial hump on the rim begins growing upward, it reaches a maximum height, and then topples outward enlarging the area of fluid motion. This process is repeated until the entire surface of the liquid is active in the creation and destruction of vertical structures and voids.
F. Merkt, R.D. Deegan, D. Goldman, E. Rericha, and H.L. Swinney, “Persistent holes in a fluid”, Phys. Rev. Letters. 92 184501 (2004) PDF PS