Beach ball animation
Meanwhile in Uruguay... it's summer!
This nice animation was created by Fabián Vitabar, coordinator of the GeoGebra Institute of Uruguay, as a part of his demonstrative talk at the GeoGebra Global Gathering, July 2015, Linz, Austria.
It is surprisingly easy to create a movie like this by using GeoGebra. Fabián also describes that in a step-by-step tutorial how to build such a nice animation from scratch.
His students also created nice and funny animations, for example one about a man who is playing with his dog.