In June 1999, I described on this page jameitos, tiny, blind, albino crabs on the sea bottom in a cave in Lanzarote, occasionally caught in a shaft of sunlight they couldn’t see. ‘Might there be searchlights moving across the surface of our world, too,’ I wrote, ‘catching [us] within their purview, and we the objects of this silent inspection, all unknowing?’

It was a long overnight flight from South America last month.