* [VIDEO: Spaß mit 9V Batterien](https://www.youtube.com/watch?v=8hwLHdBTQ7s)
* [BILDER: Ein sehr schickes Holzfahrrad](https://inhabitat.com/masterworks-wood-design-salvages-city-trees-to-make-beautiful-wooden-bicycles/)
* [BILDER: Kinetic Sculptures by Bob Potts](https://www.thisiscolossal.com/2013/03/amazing-kinetic-sculptures-by-bob-potts/)