Dr Seuss’s art director Cathy Goldsmith was on eBay when she stumbled across a sale for tearsheets from 1950s magazines, purporting to be stories by the author, who was born Theodor Seuss Geisel in 1904. She bought the stories, and discovered that the seller, dentist Charles Cohen, was a huge collector of “Seussiana” and an avid Seuss scholar.