Set the Number of Molecules slider from 100 to 300 molecules and click on the green flag. Run in Turbo to speed up the diffusion process. The BEST view is in Presentation mode. To see this process in the real world, in a flat-bottomed glass or plastic container, use an eyedropper to make a very thin layer of water that reaches to the edges of the container. Dip the end of a toothpick in a drop of concentrated dish soap, and touch the end of the toothpick to the surface of the water. This destroys the surface tension in the top surface of the water. Carefully, and close to the surface so it doesn't splash, add a drop of ink or food coloring. If you do this carefully, you will observe a nearly circular patch of the ink or food coloring diffuse through the thin layer of water. You can view this process on Youtube by clicking on this link: https://www.youtube.com/watch?v=4703-Bv6VWM
This project is an over-simplified look at the physical process that occurs when a drop of ink is placed in a very thin layer of water. The ink molecules perform random walks. Over time, the molecules drift from the center and diffuse throughout the water. This project is my first look at 'cloning'. Years ago I did this same project in Starlogo (http://education.mit.edu/starlogo/download.html). Starlogo has a crt X command (create turtles X) that commands the X number of turtles to execute (in parallel) the same procedure. If you 'See inside' to look at the code, I think you will see that I used 'clone sprite 1' to the same effect in this project.
