> Among the elaborate horses, bulls, bears and hunters, there are some other rather less captivating designs – small geometric motifs, etched onto the walls. Until now, they’ve not received much attention. I would have expected the opposite. Someone drawing animals and hunters could easily be explained simply by them drawing what they see everyday. Those other things, though, are harder to explain as merely drawings…
Characteristics for the Occurrence of a High-Current, Z-Pinch Aurora as Recorded in Antiquity
http://plasmauniverse.info/downloadsCosmo/PerattTPSv31-2003c...