Inhales oxygen. Exhales carbon dioxide (black carbon, red oxygen). Breathing with it seems to relax me.
Lungs are fractal trees. The first branch is wider, separating the two sides of lung. Relatively little code. Splits repeatedly with recursion. Speed is roughly in-out breath cycles per minute. Variant of my Lungs Breathing, which is based on my trees and plant programs: https://scratch.mit.edu/projects/785084620/ which allows you to design a greater range of plant types. I've gradually streamlined code for plant branching over many months, here adapted for lungs.
