Art is internal, photography external. Therefore one must paint with what is inside of
us, our feelings, our emotions, our thoughts before it can be called Art. If one does
on-the-spot paintings from still life to landscapes to street scenes or even portraits,
one is merely a photographer, not an artist. Because photography is capturing what is
happening all around us, not inside of us. It is an external discipline.
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fiveloaf 
But is not the choice of what to photograph an internal one?
the composition form around us. it happens beyond our control. we cannot shift the street lamp anywhere we like.