Mario's Bolex walk and Avril on sadness — "Her hair has been pure white…"
Her hair has been pure white since Mario can first remember seeing her looking down at him through the incubator’s glass.
Context
Mario's earliest memory of his mother is already glass-mediated: her face above the incubator, seen through a transparency built to keep him alive. First sight, in this family, comes through apparatus — a quiet rhyme with the scene's window-reflection greeting and with the lens he now permanently wears at forehead height (inferred framing; the raw gives only the sentence).