The colors used here are based on five basic couples of spectral colors that when combined create white light.
The inner colors reflect the frequency of the corresponding planetary influence. The progression is from the darkest violet on the bottom (Neptune) to the brightest greenish-yellow on the top (Sun); the lower color temperature, called ‘warm colors’, on the left and the higher color temperature, called ‘cool colors’, on the right.
However, the colors of the Tree aren’t stagnant. The flashing motion between the colors of the spheres and the colors of the paths create a brilliant opalescent white light when they’re moving in harmony with one another.
The path colors used here are a simple attempt to convey the idea of the spectral interaction between the spheres. I must say however, they do not convey the actual interactions of these pathways very accurately. But for lack of a better example, for now, I hope it is better than nothing.