Silhouette are terms
from painting, optics, photography. They are used to describe the
outline or contour of a surface or the area enclosed by this contour,
which stands out darkly against a light background (or vice versa).
This can also be a natural contour (for example, the shadow of a body
or the contour of a city (skyline) created by building development) or
an artificial one (for example, a shadow drawing or silhouette).
This is how the term "silhouette" is explained in wikipedia. I like
such photos, even if they are quite easy to realize. A bright
background and a motif, which can be transformed into a silhouette by
selective underexposure. But that's exactly how it works the other way
around! A dark background and an illuminated subject in the
foreground. But you can also create silhouettes only in a
part of the photo. So there is enough leeway to be creative...
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