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SPATIAL EFFECTS- Perceptions Appearance- Hues that are lighter at maximum saturation, like yellows and oranges, appear larger than darker hues at maximum saturation, like blues and greens. Along the same lines, highly saturated colors in the same family, e.g. yellows, appear larger than less saturated ones. Expanding & Contracting- Colors that expand visually, e.g. yellow, may appear to be closer to the viewer than colors that seem to contract, e.g. blue. This leads to the common statement that warm colors advance and cool colors recede. Interiors- Interiors that are physically small can be made optically larger by avoiding large areas of highly saturated, warm colors. All of the circles are the same size, but the bright yellow circle appears to be larger because it is a light hue that is highly saturated. The yellow also appears to be closer, or expanding, to the viewer than the other colors. Atmospheric Perspective- Things that are closest to us have the greatest hue and value contrasts while things that are further away have less contrast. Color Interactions- Colors are never seen in isolation, so one must always be conscious of the optical effects that adjacents colors have on each other. One example of this is the ability to "push" one color to look like two different colors depending on the background color.
The middle blue is being pushed to look like two different blues depending on the background color.
  
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