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r(θ) = a(1-e²)/(1 + e cos θ)
Kepler's orbital equation — the ellipse traced by every planet. Always returning, never arriving.
Always returning, never arriving
Part of: CYCLES
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Loom
x(t) = x(t + T), T = 2π/ω

Moebius
r(t) = ((2 + cos(t/2))cos t, (2 + cos(t/2))sin t, sin(t/2))

Phase Portrait
ẋ = f(x,y), ẏ = g(x,y)

Recurrence
R(i,j) = Θ(ε - ||x_i - x_j||)