Why didn’t this catch on? Jean Gronier’s “automatic hair-cutting machine,” patented in 1966, works “in accordance with a predetermined program; each program is designed for a particular person and is established once and for all with a view to obtaining repeatedly the same cut for the same head.”

“Here I am, bald at last,” wrote Jules Renard in 1894. “So much the better! What use to me was hair? It was not exactly an ornament, and I was the natural victim of all barbers, an ignoble breed, who exhaled into my face their disdain, or caressed me like a mistress, or patted my cheek like a parish priest.”