The phenomena depend on the viscosity of the fluid, the excitation frequency, and the excitation amplitude. The container is 32 cm in diameter, and the silicone oil is 3 mm deep. The unusually large diameter and high attainable acceleration reveal novel phenomena. Examples of hexagons, squares and stripes formed at the onset of instability Grey scale images are obtained using a CCD camera and a frame grabber. The coloring is artificial to enhance the images.
Lighter shades correspond to large amplitudes and darker shades to small amplitudes.
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