I was disturbed in the night by my granddaughter tip-toeing the corridor – no sound, no sign but a subtle change in the light through my door so slight her little body, so soft her foot as she felt her way along the carpet and yet enough to wake me as I lay.
The course of the universe may be altered– so they say– by a butterfly though our own identity may be doubted as solid integrity for one electron will shift another without a touch – and an atom move a star – so why then should we be concerned if a perturbation of light is all we are.