Simultaneous Contrast / After Image
Click here to view relative historical backgound

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As you view the colors below, take note that the color in the middle is the same on both sides of each set.
for this to work well, allow your eyes to rest on each set for 15-20 seconds.
Notice how each middle color gradually increases contrast to one another.
Why does this happen??

Below: Contrast of Value

Click to view a link on Value Contrast

 

Below: Contrast of Hue

 

Below: Contrast of Chroma (Intensity)

Click HERE for detailed explanations