“Seen from Earth, a comet is a prodigy, coming out of the void for no reason, returning to the void for no reason. They call it unpredictable because they cannot predict it. From the comet’s own point of view, nothing could be simpler. It starts in the outer darkness, aims directly at the sun, and never stops till it gets there. Everything else spins in its same orbit forever. The comet heads for the source. They call it crooked because it is too straight. They call it unpredictable because it is too fixed. They call it chaotic because it is too linear.”