Thea in Queensland, Australia, with whom I swap postcards regularly, thought she would make me work for my postcard this time around. This postcard-sized puzzle arrived in an envelope in 48 pieces. I thought I might delegate this to 6-year-old Grandson #2, but then I looked a little more closely. If you examine the individual pieces rather than the completed picture, you will notice that almost every piece is an abstract mess of wavy lines or dots.

The joke’s on Thea, though. I let the puzzle sit for four days, being extremely busy with work; the missus decided to put most of it together for me. She figured out Leonardo; I filled in around the edges.

This “postcard” came from a Da Vinci exhibition near her home, with working models of Leonardo’s vehicles and some of his other inventions, built according to his plans.