Although this sample project has only one sprite and the sprite has two
costumes, through the use of the stamp block (located in the
Pen group of blocks, several static impressions of the costumes are
made on the screen. Other blocks from Pen also used in this lesson
include the clear and pen up blocks. Try sticking a pen
down block in the code to see what happens. Try out a few other
Pen blocks while you're at it.
Extend the sample project in the following ways: