Why do some shadows have a secondary, lighter shadow around them?
In: Other
Usually this has to do with multiple light sources from the same direction but different distances/angles.
Shadows cast by large light source will have regions around the borders where only part of the light source is blocked. [This is called the penumbra.](https://upload.wikimedia.org/wikipedia/commons/2/2e/Diagram_of_umbra%2C_penumbra_%26_antumbra.png)
If you have two light sources pointing at a object, they cause two different shadows. If these shadows overlap, the overlapped part becomes a darker shadow than the non overlapping parts.
Two or more light sources, one of which would be of different intensity and or distance from the object casting the shadow (i.e., five bulbs from one chandelier).
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