I'm going out on limb and say they aren't fully textured Godslayer.
Plus those aren't real bones on display, it's glossed mould casts. For effect. The real bones are kept in secure drawers behind the scenes.
I have this strange feeling that Rexy's bones are to damn well clean. What? Did Rexy imagine a tank of bleach when I wasn't looking?
http://dl.dropbox.com/u/2347130/escarpment/laser1.jpg
That's sweet an all, but also not cause it's not really original.
3) The displacements are too uniform between stairs, thus it looks funny.
Maybe if they got that way by having someone roll a huge boulder down them it might be realistic, but...