Take a moment to observe:
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W
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C
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The Analogous Scheme. The Monochromatic.
This scheme uses adjacent colors. It's calm like a monochromatic work, but then again, more vivid. Choose one color as the main theme and let the other flow through.
Example:
Colors
(Home)
Primary colors
Secondary colors
Tertiary colors
Color Schemes
Analogous
Complementary
Split-Complementary
Triadic
Tetradic