This movement feels like a sonic collage: layers are juxtaposed, there are abrupt shifts of character and passages where the texture becomes diaphanous, sometimes almost ceremonial despite the lack of a tempo marking. You will specifically face Polyrhythm 2 against 3 (3.1/5) — here the challenge is to secure hand independence through small adjustments in subdivision and accents so the crossing patterns remain clear — and Harmonic Analysis (3.6/5), which requires identifying and executing sudden harmonic shifts and bitonal overlays by finely balancing the voices. The piece belongs to Ives's modernist exploration, showing experimental approaches to the sonata form and piano writing. I do not give a reference interpretation here, out of caution.