When I was a child, my father enchanted me by making shadow butterflies, bunny rabbits, donkeys, and all manner of other animals with his hands. But shadows also frightened me. My grandmother’s house in Wales had no electricity. Downstairs was lit by gas and oil lamps, and upstairs we used candles. At one point, as you went upstairs to bed, there must have been an updraft because I remember the candle flame got long and thin, and my shadow on the wall was huge and terrifying.