These are radio drama staircases
by David Pescovitz from on (#1RMFT)
These unusual "radio drama staircases" are inside the BBC's sound studios. When an actor is recorded walking up or down the stairs, the different surfaces (wood, carpet, cement) give the acoustic impression of unique locations for the radio drama. Samuel West shot the image above at BBC's Maida Vale Studios. Apparently, they are actually functioning staircases that lead somewhere in the building.
(via Neatorama)