Nematode Body Structure. The phrase tube-within-a-tube is a convenient way to think of nematode body structure, and also a term used to refer to a major trend in the evolution of triploblastic metazoa (Brusca and Brusca, 1990 Invertebrates).
Neutrals and Universal Colors. Let me explain in details... In general, neutrals include black, white, gray (mix black with white and you've got gray) and different shades of brown. Nowadays a color can be called a neutral based on how effectively it can blend in with other colors. Basically, they match with all colors and color combinations - and don't create much of an emotion.
Consider designing with a gray color scheme. Neither boring nor drab, gray is perfect for creating a chic new look in your home. Gray is often used as a color for formality, like in this sophisticated dining room. The neutral background is highlighted by fabrics in graphic prints, stainless steel fixtures and white accessories. From: Erinn Valencich.