Header of text saying Perceptual Stuff

 

 

Look at the center of a figure and try moving closer and further from the figure semi-quickly. The effect is a change in the apparent brightness.

 

We call the effect the "Here comes the sun" effect

 

DynamicLuminance Illusion

 

 

The effect occurs regardless of the number of stripes.

 

DynamicLuminance Illusion

 

 

Dynamic Luminance Illusion

 

The phenomenon is sometimes even stronger with blurred figures.

 

DynamicLuminance Illusion

 

 

Notice the changes both toward the center and at the outer edges in this extension.

 

Dynamic Luminance Illusion

 

The illusion does not occur if the figure is posterized and has just five gray steps

DynamicLuminance Illusion

 

Or ten steps.

DynamicLuminance Illusion

 

But effect does occur to some degree when the number of steps increases to twenty and the figure begins to approximate those with continuous, gradual change.

 

.DynamicLuminance Illusion

 

The effect also does not work when the figure is broken into a mosaic.

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Interesting variations can happen with variations in hue.

DynamicLuminance Illusion