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, Wisconsin, 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.

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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 Bol recalled, his neighbors “talked to it like it was a little puppy.”

This week, many bore a white ribbon in tribute to 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.