Algodoo

An explanation of what this scene does or what it's about would be helpful.

there is one?

added input labeling, but I did think whatever I did prior to that was sufficient

Well, it's your scene, and as long as it doesn't violate any rules, you can do what you want with it. I was only making a suggestion to explain what this scene is about. So far, you haven't explained anything about it. You only showed what keys to press to make the gears go forward and backward. That doesn't say anything about what an "additive mechanism" is or does. I see gears turning and I see some pretty colors. That doesn't mean anything to me.