g. health, while others are not,
e.g. a house. The reason is that in some cases the matter which
governs the production in the making and producing of any work of art,
and in which a part of the product is present,-some matter is such
as to be set in motion by itself and some is not of this nature, and
of the former kind some can move itself in the particular way
required, while other matter is incapable of this; for many things can
be set in motion by themselves but not in some particular way, e.g.
that of dancing. The things, then, whose matter is of this sort,
e.g. stones, cannot be moved in the particular way required, except by
something else, but in another way they can move themselves-and so
it is with fire. Therefore some things will not exist apart from
some one who has the art of making them, while others will; for motion
will be started by these things which have not the art but can
themselves be moved by other things which have not the art or with a
motion starting from a part of the product.
And it is clear also from what has been said that in a sense every
product of art is produced from a thing which shares its name (as
natural products are produced), or from a part of itself which
shares its name (e.g. the house is produced from a house, qua produced
by reason; for the art of building is the form of the house), or
from something which contains a art of it,-if we exclude things
produced by accident; for the cause of the thing's producing the
product directly per se is a part of the product.
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