A six-year-old in Dom Sierot once spent the better part of an afternoon trying to tie a knot. An older child offered help; she refused. A staff member approached; Korczak stopped him with a look. The child failed repeatedly, face moving through frustration, concentration, something like anger at the string itself, then sudden stillness — the stillness of a mind finding a new approach — and then, finally, the imperfect knot. What mattered was visible only if you knew what to look for: the child's face afterward. Not triumph, but something quieter and more durable — the recognition, felt in the body before language, that she had done a hard thing. Korczak built his framework on the observation that this experience is not merely useful for skill acquisition but constitutive of the child's selfhood. The child who struggles and succeeds does not simply acquire a skill. She acquires a knowledge of