The white particles are initially close to the tree root,
when the colored particles (orange, magenta and blue)
depict particles that are initially close to three of the leaves of the tree.
All 25703 particles own exactly the same physical properties.
Here are some close-ups of this diffusion process:
(CMAP28 WWW site: this page was created on 10/24/2001 and last updated on 04/02/2019 07:53:05 -CEST-)