Read a really fantastic explainer article last night about mechanical watches.
Aside from explaining a complex technical object in a clear and easy to understand way, the article stands out by its use of small interactive 3D scenes to demonstrate the physics and interactions between various elements of the mechanism.
Definitely worth a look for anyone interested in 3D visualization or technical education. Also, watches.
Plus, the author has a variety of other articles on subjects such as GPS, ship design, lenses & cameras, and engines. All written in the same detailed way. Very cool.