On February 28, 2001, an earthquake of magnitude 6.8 rocked the US state of Washington cracking sidewalks, toppling buildings, and causing some $2 billion worth of damages all throughout the state.
In Port Townsend, 65 miles north of the epicenter, a local shop called ‘Mind Over Matter’ had a sand-tracing pendulum on display, featuring a pointed weight at the end of a long wire suspended over a tray of sand. The natural swing of the pendulum causes the weighted tip to trace long lines on the sand tray. But that day, as the ground shifted, the sand pendulum drew a strange pattern on the sand resembling a rose.
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Source: amusingplanet.com