Time, as we know it, is the original shape-shifter. Now the line of it runs straight as an old railway track; now it is a circle – many circles, in fact. Now it dances without moving – to and fro across millennia – around the whole turning world, filling the night sky with bounding green lights. Past, future, present: the unbidden, ineffable gift of it all. Memory is like a white moth in flight. Sometimes she comes so close that we can see the light falling into the hidden parts of ancient markings. On other days we cannot see her but we feel the delicate wing-beat down deep, in beside our bones.