Soru

Read the following passage:

The bedroom at the top of the boarding house on Dock Street looked out over the oily, sluggish waters of the Grand Union Canal. It was a room defined by its narrowness, squeezing the iron bedstead against a damp-stained wall where the floral wallpaper had long since peeled into grey ribbons. A single, soot-filmed sash window faced the eastern basins, permitting only a sulfurous, yellowed morning light to filter through. This light, rather than illuminating the room, seemed only to suspend the floating dust motes in static shafts, catching the tarnished edges of a washbasin and the cracked pitcher beside it. Every twenty minutes, the rhythmic shudder of the coal-barges passing below vibrated through the floorboards, a low, mechanical hum that rattled the loose pane in its rotting frame and then subsided, leaving the silence heavier than before. For Arthur, the room did not merely house his few possessions; its persistent chill and the smell of wet coal dust seemed to occupy the very space where his thoughts should have been, leaving him to watch the slow, circular drift of the dust in the pale light.

In the passage, the descriptive details of the setting—specifically the 'static shafts' of light, the 'sluggish waters,' and the recurring vibration of the coal-barges—primarily serve to convey which of the following?