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Afterimage effect

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Monochromatic: one color
Dichromatic: two color
Trichromatic: three color

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Color
Depth
Form
Motion

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Illusory triangle:

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Your brain concepts various perceptions

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(a) Waves vary in wavelength, the distance between successive peaks. Frequency, the number of complete wavelengths that can pass a point in a given time, depends on the wavelength. Shorter wavelength, the higher the frequency. (b) Waves also vary in amplitude, the height from peak to trough. Wave amplitude determines the intensity of colors and sounds.