Cave paintings (L): my wife saw horses. I saw bison and it reminded me of famous cave paintings. Notice it also flip-flops symmetrically. Epicycles (R): after 1/81, 1/9801 is the second in that series (the next being 1/998001) and No.2 shows a greater resolution to the ‘spring’, adding a smaller set of epicycles. The third has even more epicycles. Note they all drift.

Sean is a PhD student researching geophysical fluid dynamics at UCL. He studies coastal outflows, but so far has been unable to persuade the department to send him on a research trip to the beach.

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