Many Scratchers assure that the stage (background) moves and changes color... Can you believe them?... ;) https://scratch.mit.edu/projects/537224578/ #Phisics
https://michaelbach.de/ot/ Spheres of Santiago020267 https://scratch.mit.edu/studios/31960862/ 3D of Santiago020267 https://scratch.mit.edu/studios/29839504/ https://en.wikipedia.org/wiki/Torus https://www.vitonica.com/anatomia/siete-ilusiones-opticas-y-su-explicacion-cientifica-asi-es-como-tu-cerebro-engana-a-tus-ojos
