How does Peter Weiss use imagery in Marat / Sade?

Imagery:

"We're all so clogged with dead ideas passed from generation to generation that even the best of us don't know the way out."

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Singers: We've got nothing always had nothing nothing but holes and millions of them

Kokol: Living in holes Polpoch: Dying in holes

Cucurucu: Holes in our bellies

Rossignol: and holes in our clothes“