A method of digitally making moving picture animation films formed by manipulation of a computer touch screen, the method including the steps of displaying on the screen an image of an array of particulates, such as sand, manipulating the particulates to form a first image, storing a copy of the first image onto computer memory, thereafter altering the first image on the display screen to form a second image and again storing a copy of it to memory, the sequence continuing until a required number of images have been made and stored, and thereafter replaying the stored images in sequence to form a moving picture animation film.