Actors that move about the stage are represented by their shapes. By default actors are shown as a circle containing a line that points in the actor's current movement direction. Actors can be programmed to take on other shapes, such as filled or hollow circles, ellipses, squares, rectangles, or even any bitmap that can be read from a file. All standard file format such as JPG, GIF, PNG are accepted, which makes it easy to use photos, images downloaded from the internet or cutouts from them.
The applets below show the effects of the shape changing statements shown to their right.