Circling Wave Umbrella
fluttering waves that whirl around the edge of the umbrella show
how random motion can create a regular pattern. As the fabric spins
it forms pockets of swirling air that set it flapping like a flag
in the wind. But unlike a flag, this cloth is bound into the shape
of a circle. The waves bump into each other as they spin, interacting
to create patterns of evenly spaced ripples.