Hey all, It's me again. Haven't you missed me? I had the great opportunity to go and visit the guys at Valve, and among other things, some of the TF2 level designers let me have a look through some of the books they used for references. I figured you'd like to see them, so I grabbed some photos on my phone. This is the one they used for Foundry. They used the blue stickers (coming out of the top) when they found something they liked. Not everything they liked went in, but a lot of it is very close to what's in the books. This one's a little blurry, sorry, I was in a bit of a rush. This is the one they used for Granary (no shit, sherlock), and I think the cover photo was used as inspiration for the middle control point. Also, that is a custom Hammer-colour-coded keyboard there. It was awesome. The books are by a couple who go around taking photos of old things, and these two books were used really heavily in the design of Granary and Foundry. If anyone can find a copy of these books online somewhere, you should definitely link it here. Hope this is useful guys!