Half-Pi, Pi, Tau and Rho

Instructions

4 Half-Pi's add up to Numberblock Tau. The written maths: ½π + ½π = π (Pi) π + π = τ (Tau) τ - π = π 2 x π = τ (Numberblock τ stands 4 blocks wide) τ = π + π π + π + π = ϱ (Rho) ϱ = π + π + π ϱ (Rho) is actually more commonly written like this --> [ρ]