When the facility was nearly destroyed and Chell finally gone, GLaDOS started to rebuild the ruins of her existence. The test chambers were a mess, pipes were missing, connections to deeper located premises unavailable. Chaos in plain sight and behind the curtain. But then again there were parts, secret passages, hidden corners, where ideas were concealed. Testimonies from olden days decorated grey walls to embellish the story of a lunatic man. He may have been possessed by the devil himself, but no one was able to vouch for the thruth of this far-fetched proposition because no one ever came back.
Some of his works -if it's allowed to use this description- were remarkably well-wrought. An octogonal room of way too little space became an eight-page long comicesque portrayal of his cosmovision. Although his cosmos.. was a hole-in-the-wall.