ψ = A · sin(kx) · sin(ky)
Standing wave pattern in two dimensions — a fixed geometry of nodes and antinodes. Nothing moves. Everything vibrates.
Perfect stillness made of perfect vibration
Part of: PEACE
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∂ρ/∂t = 0, ∇·(ρv) = 0
∇²f = 0
∂h/∂t = ν∇²h - λ(∇h)² + η
v(t) → 0, x(t) → x_eq
