The frog is jumping on pont lilies randomly. Each lily is associated to a direction (up, right, down and left) as the corresponding arrow depicts. The direction of each lily is changing by clicking on it. The pencil is following the directions of the the lily for each jump. Choosing the directions can control the pencil despite the fact that each jump chooses randomly a lily that is not possible to be predicted. The whole microworld is based on the formal problem of the random walk (or drunk ard's walk). Can you make the pencil go where ever you predetermine; Can you make the pencil draw specific schemata; Have fun. G.
