No clock, but we must collaborate. We're back at the position of the sun. Meet you at sun-overhead. Come back before dark. Fastest is done only by comparisons, not absolutes. No timer (except of course, for me, the writer). I predict that the first thing people would do if clocks and the idea of time were knocked out of their heads, would be to reinvent them. Sundials would appear within days. People would watch water drops, listen to bird song, sing themselves and coordinate singing. Drums would count time. Breaths. If numbers had vanished with clocks, people would start again with toes and fingers, hair would represent infinity.