The Fluid Stairway concept from Bosch & Fjord is really simple, but a totally different approach to carpeting and flooring in stair wells.
By their nature, stairs carry and sweep people throughout buildings, and this reminds me of blood sweeping throughout a building. In fact, this is sometimes referred to as the 'Body Fluid Stairway Carpet'.
I am being scuttled by the fact I can only speak English (not Danish) on filling you in with more details of this. I have manged, however, to work out that it is not yet available to the public. Sorry.