Apologies for the shitty video quality.
There's so much I could say about this piece simply from watching the video (I've never seen it, sadly). Foreman, who wrote the libretto, directed, and designed the opera, is a master of blocking, in my opinion.
He has a wonderful book of essays and manifestos that I think anyone interested in theatre should read. His imagery and words are not inherently "random", although he does embrace a sense of improvisation in his writing and rehearsal methods.
He's also a smart mother fucker. He is extremely well read on psychology and philosophy, and incorporates a lot of these elements into his plays — although he makes a strong effort not to be pretentious, and ensure that audiences have a "good night at the theatre".
edit: Michael Gordon is the composer.