A little arithmetic, made visible

Nicomachus's Theorem — a visual proof

A visual proof: each cube k³ forms the border between squares of side Tₖ₋₁ and Tₖ, where Tₖ = k(k+1)/2.

Four cubes: 1³, 2³, 3³, 4³ — that's 1 + 8 + 27 + 64 tiny unit cubes.

v2026.10.03-01