Works of art are created in a that is headed by a

A work of art, artwork art piece, piece of art or art object is an artistic creation of aesthetic value. Except for "work of art", which may be used of any work regarded as art in its widest sense, including works from literature and music, these terms apply principally to tangible,

Explanation:

The helots did all the menial work,in particular everything associated with agricultural production - which the Spartans needed for their food supply.

Without control of the helots,the Spartans would have had to do their own farming or starve,and thus wouldn't have had the time to train as full time soldiers,so they would have had no military power.