I'm not really sure that there is a formal
definition of natural and artificial light.
Usually we use the term natural light to describe
light that comes from the sun, and artificial
light to describe light that we have to make
somehow after the sun sets or if we're in a
basement. In that sense, light from a flame is
artificial since we are making it.
other hand you could argue that there is nothing
artificial about a fire (and in fact the sun is
really a big fireball that puts out a lot of
So I think the answer to this one
could go either way.
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