I am emerging into the light after the first chapter of potty training our toddler. You press a button and something happens – a light goes on or a sound comes out or an explosion goes off. Whenever we get home, as soon as my daughter sees the doorbell, she says: “I want to press button.” Like many other children and indeed adults, she enjoys pressing her mother’s buttons, too. A button works perfectly under pressure; a process may collapse. A button is easy to press; a process can be hard to bear.