While it was never going to be a PC game, there's historical interest in Irrational's first attempt to make a game before the console. The Lost was a third-person horror game for the PS2 which was trying to put in a mass of the sort of System-Shock-2 RPG-elements into a Dante-esque world. Irrational have been rooting through their files generally, and released some of the concept art and design notes, which are fine to stare at/read. As picked out by Chris Remo, I especially like the contrast between really specific guidelines (like the door hole being precisely 216 x 128 units) to the gloriously foggy (I quote: “Any other cool shit you can dream up”).
We've been talking, and we think that you should wear clothes
Total coincidence, but we sell some clothes