These flower shapes were made by my Lego Ev3 mecha, equipped with a marker and following a special program written on the Mindstorms software. Each of the 7 petals of the flowers corresponds to a group of commands in the program: A curved line, a small turn, a similar line back and another small turn. (For a curved line you have to change the speed parameters inside one command: decrease the speed of one caterpillar and increase the speed of the other.) These operations are repeated 7 times, wherefore the flower shape is created. We scanned the drawing and used GraphicConverter to color it in.
