Nope, not stairs. Something much more interesting! I opened it up if anyone wants to take a look (at the back)... Spoiler: Opened Up
@cimarronline I imagined that there were no stairs when I noticed that R came out on his back ... that said, I think the author should have taught (as you have done, thanks for that) what happens inside
I *think* this effect was used in Gravity gun by @Block builder. His level is well worth playing if you've not already done so.
@Neophyte Yes, that level uses the claustrophobia move with B. XSHY is showing a way for R to walk up the incline.
@XSHY ... it's like a Magic hidden escalator @cimarronline .... very cool moves and thanks for showing the workings behind the scenes