The room was reached by climbing a set of dog-leg stairs which lay immediately inside the exterior door. Filthy and monochromed by years of uncare, the stairs were long-neglected and used infrequently. A single strip light illuminated the steps, its weak yellow output barely uncovering the recesses or corners of the passageway. The ends of the fluorescent tube flickered dimly and uncomfortably and as a result the edges of things appeared blurry and undefined and the small square landing that joined the two perpendicular sets of steps seemed almost to be hovering in place.
The figure at the top of the stairs traced a figure in the dust.
Moving carefully, the man (for it was he) returned to ground level, just as he had ascended, diligently placing his footsteps into the marks left only seconds before. An unobservation, one made without seeing the initial act, would be that the man had simply disappeared the moment his fingers left the dust.