It’s a striking introduction to the esoteric, obsessive mindset of the Hamburg collector whose collection — from which both these artefacts come — will go on sale at Christie’s on October 16. Klaus Hegewisch died in 2014 at the age of 94, and, as his six children attest, it was easier to understand him from the drawings and prints he collected — which span five centuries — than from day-to-day interaction. “Art is how he made sense of the world and humans,” says his daughter Jessika. “As children we were taught to have the utmost respect for art and artists...