The writer points out that we cannot .

There really is no such thing as “Art”. There are only
artists. Once these were men who took colored earth
and roughed out the forms of animals on the walls of
caves. Today they are men who buy their paints, and
design advertisements or paint pictures which they
hope to sell. There is no harm in calling all these
activities art as long as we keep in mind that such a
word may mean very different things in different
times and places.