The project below is a pen-art playground. The sprite has a cleanup script (press the space key to reset), plus three numbered scripts to explore: script 1 draws one fat line so you can experiment with pen size and the flat line ends setting, script 2 calls a custom tunnel block that draws rings that get darker and smaller, and script 3 calls a custom sphere block — like tunnel but with inputs for steps, color, and size.

Experiment with the scripts and look inside the tunnel and sphere blocks to figure out how they work. Could you change the sizes or colors to make the picture more interesting? Then invent some artwork of your own.

Your work autosaves (and you can use the Save button); earlier versions are available from the Revisions dropdown.