28. If you expose a sheet of glass for some extended time to the sunlight, it will begin to show all kinds of colors on its outer surface. Why not on the inner surface, too? Because the inner surface is not exposed to the sunrays first strike.

29. Place a pot plant in a dark cellar. Even if it does flower, the blossoms will show no color at all or only a very pale color.

30. This shows that the colors of flowers and fruits are also a work of the active light spirits of the sun ray.