Rainbow Lamp - Click the Green Flag to turn it ON! Thereafter Click Stage to turn Lamp Scrolling Off/On. Move the Mouse to the top 45 px to change the Lamp's Size, Speed & Direction in which it flows and the % of Highlight. They can be changed while it's On. Then watch for a while until you get bored by it. Then maybe check out my "Greg's Pen Art" Studio: https://scratch.mit.edu/studios/25184965/ where you'll find much more interesting stuff.
Created by @gregatku for use in Coding Classes for Kids Unlimited, for whom I work as a Coding teacher. This project was just me mucking around with Pen Art! Originally designed for a fixed Size of 6. The distances & other fixed numeric values were determined by "educated" trial & error. I decided to add the Size & Speed parameters later, because the Project was a bit too boring without at least a bit of interactivity. The Highlight% option was added later, and finally the Flow direction supported by allowing Negative Speed values