What does it mean when someone is referred to as "sisyphus"?

As a metaphor for frustrating and futile labor, the point of this being a punishment for Sisyphus is that it an eternal waste of time and energy. That it is repetitive makes it frustrating because it is the repetition of something boring and useless.

the sentence that avoid faulty coordination is:

culture, which is well represented in philadelphia, plays a major role including theatre, music, and the visual arts.  

faulty coordination occurs when the writer gives equal importance two different ideas (clauses) which in fact are not equivalent. in order to correct a misplaced clause or idea, the writer can place less important or emphatic ideas in a relative clause as in the previous sentence.  

"the sandy walls seemed to collapse in on themselves"

and

"the bloodshot waters seemed to have no bottom"