The "stamp" block can be accessed by adding the Pen Extension. When used in a script, the "stamp" block will allow you to produce a duplicate image of the sprite and stamp it onto any location on the stage.

 

Because the stamp is simply an image of the sprite at the moment it was stamped, it cannot be programmed but can still be a powerful tool to create interesting patterns or movement tracks. For example, try creating a piece of an image (like a petal) that can be repeatedly stamped in a pattern to create something new (like a flower).