This Little Free Library in the McKinley neighborhood of Minneapolis appears to have a small reading loft, big enough for a city mouse.

Father Time stands sentry at a Little Free Library in the rough-hewn Payne-Phalen neighborhood of St. Paul.

We made a decision early on, for reasons I do not recall clearly, to avoid linking out to obituaries–even for heroes whose lives have resonance in our pages. This one made me think twice about that decision.

In part it is because we have paid an enormous amount of attention to libraries over the years. Also, this man’s innovation (did we really never feature it in our pages before?) was clearly in the realm of what we call entrepreneurial conservation. And maybe, just a bit, I like the idea that the first little free library (the last one displayed below) was a tribute to the innovator’s mom.

Thanks to the New York Times for getting this story just right:

Libraries, Writ Small

This Little Free Library enjoys the open space of Triangle Park in Minneapolis.

Todd Bol’s Little Free Library boxes, which blend the form of folk art with the function of a community water cooler, have popped up in all 50 states and in 88 countries.

By Katharine Q. Seelye Photographs by Ethan Jones

This Minneapolis library is a classic of the genre, with its Plexiglass front and gable roof, supported on a sturdy post.

Todd Bol was simply paying homage to his mother, a schoolteacher and lover of books. He built a doll-sized schoolhouse, filled it with his mother’s books and put it out for his neighbors in Hudson, Wis., as a book exchange.

Today, just nine years later, more than 75,000 such “Little Free Libraries” dot the globe, from San Diego to Minneapolis, and from Australia to Siberia.

Why did they catch on? For starters, they promote a friendly, sharing economy. No one tracks who took what. There’s no due date. No fines. You might never return a book. You might leave another instead. And, they are inherently cute. As Mr. Bol recalled, his neighbors “talked to it like it was a little puppy.”

This week, many bore a white ribbon in tribute to Mr. Bol, who died Oct. 18, in Minnesota at the age of 62. Here, a photo-essay of some of the little libraries near his hometown.

See all the other photos here.