Similar films or plays
I've always been struck with how Marat/Sade fits in with the mileu of late sixties films expressing a similar kind of philosophical misanthropy such as Godard's Weekend and even Lindsay Anderson's If...
More recently, Jan Svankmajer's Lunacy bears more than a hint of Marat/Sade, even containing a subplot with de Sade preparing a tableau vivant in homage to Delacroix's "Liberty Leading the People" with the inmates of Charenton Asylum.
I know of Marat/Sade's roots in Artaud's Theatre of Cruelty and Brecht's Epic Theatre, but my knowledge of drama is fairly limited compared to my knowledge of film. I was wondering if anyone knew of other plays thematically or stylistically similar.