As millions of people hunker down at home amid the COVID-19 pandemic, the humble jigsaw puzzle is enjoying a renaissance. Several puzzle-makers recently told NPR that in March and April, they saw U.S. sales leap by 300 percent or more compared to the same time last year. That means that kitchen tables and living-room floors are probably scattered with bits that add up to all kinds of scenes: litters of kittens, beers of the world, monuments and streets that are now forlorn. But several centuries ago, jigsaw puzzles were mainly…
