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Shadows of visitors to the Eiffel Tower, viewed from the first platform
Park fence shadow is distorted by an uneven snow surface

A shadow is a region where light from a light source is obstructed by an opaque object. It occupies all of the three-dimensional volume behind an object with light in front of it. The cross section of a shadow is a two-dimensional silhouette, or reverse projection of the object blocking the light.

Shadow sections
Intro   Point and non-point light sources    Astronomy    Daytime variation    Propagation speed    Color    Photography    Three-dimensional shadows   Shadow inversions   Analogous concepts    Cultural aspects    Gallery    See also   References  External links  

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