The Sailing Stones of Racetrack Playa
On the dry lake of Racetrack Playa in Death Valley, stones weighing up to three hundred kilograms leave furrows hundreds of metres long, sometimes parallel, sometimes turning at right angles. Since 1948 magnetic fields, hurricanes, algae and human interference had all been proposed; nobody had ever seen one move. In 2011–13 Richard and James Norris put GPS units on the stones and a weather station with time-lapse cameras beside them. On 20 December 2013 they watched it happen: after rain the playa freezes over a few millimetres thick, the ice breaks by day into floating panels, and a wind of four or five metres per second is enough for the floes to push the stones at walking pace.
Petit-Rechain and the Belgian Triangle
The photographic centrepiece of the Belgian wave of 1989–90: a black triangle with a light at each corner and one in the middle, taken at Petit-Rechain near Verviers in April 1990. It went round the world, was analysed at the University of Mons and the Royal Military Academy, and produced expert talk of plasma and of an image impossible to fake. In July 2011 Patrick Maréchal went on RTL-TVI and showed how he had done it: a piece of polystyrene painted black, four spotlights and a long exposure. He had kept it to himself for twenty-one years because the joke had got away from him.
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