Spoilers.

The turret you pick up off the conveyer belt says "Prometheus: The titan who stole fire from Zeus and gave it to man. By his cunning and foresight, he was picked apart by birds."
 Which is funny cos we know someone in this game who gets picked apart by birds.
I wonder if there's anything else tha-- OH CHRIST!

haha my friend linked me this from /v/ yesterday, my mind was blown.

Interesting. You make good points.

interesting..

Interesting, I thought this was gonna be a stretch but it kind of makes sense. Those Valve guys know their history

Coincidence 

The figure in the Cave Johnson portrait is probably not Aeschylus.  It only vaguely resembles an audience member from the other painting, An Audience in Athens During Agamemnon by Aeschylus.  On top of that, it's doubted Aeschylus even wrote Prometheus Bound, let alone Unbound.