Amorphous
This activity belongs to the GeoGebra book GeoGebra Principia.
The achieved versatility is significant. For instance, we can literally make figures "jump through the hoop". Let's remember that at no point is the shape of the whole set determined; rather, it's a result of the vectorial addition corresponding to the position reached at each moment.
Author of the construction of GeoGebra: Rafael Losada.