Richard Scarry was an incredibly prolific children’s author and illustrator. He created over 250 books during his career. His books were loved across the world — over 100 million were sold in many languages. But here’s something you may not have known about these classics: They’ve been slowly changing over the years. Don’t panic! They’ve been changing in a good way. Scarry started publishing books in the 1950s, when times were, well, a little different. So some of the details were quietly updated. Alan Taylor, a senior editor for the photo section of The Atlantic, noticed differences back in 2005 and decided to photograph them.

See them here: 8 changes that were made to a classic Richard Scarry book to keep up with the times. Progress!