All English comprehensive school desks must by law be engraved, somewhere on their surfaces, with stylized representations of human primary or secondary sexual organs. Why is it whenever some new prehistoric cave art is uncovered it’s always men with spears pursuing unfortunate savannah ungulates? Why do they never find badly-drawn pictures of genitals or breasts on the walls, even though, for example, early Britons were happy to carve enormous erections on hillsides?

Here’s a picture of a cloud.