The shadow blister effect is a visual phenomenon in which a shadow bulges (or blisters) as it approaches another. The effect takes place when two objects are at varying distances between a non-point light source and a background upon which their shadows are cast.
The shadow blister effect is a visual phenomenon in which a shadow bulges (or blisters) as it approaches another. The effect takes place when two objects are at varying distances between a non-point light source and a background upon which their shadows are cast.
Source: Wikipedia "Shadow blister effect" · CC BY-SA 4.0
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