Green: Because of its association with nature and foliage, green in design can be used almost like a neutral colour: greens never clash with red or pink roses, yellow sunflowers, lilacs or bluebells.

In every law of nature there is a major and a minor; a positive, a negative, and a neutral.

Interactions of photons and electrons with atoms, molecules, and ions are fundamental elementary processes in a wide variety of neutral or ionized gases in nature or laboratory.