A hostly monolith pulses, its varying colours the only source of light in the room. Shades of purple and red waft over its surface, and it almost seems to be breathing, keeping time with the rapt crowd. But this is no biological rhythm, it is something on a greater scale. The light playing across the 4.5-metre-tall standing stone is that of cosmic particles as they dance through the Earth's atmosphere. Or rather, as they are detected at the Super-Kamiokande observatory at the University of Tokyo's Institute for Cosmic Ray Research in Japan.
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