Hue = arg Ai(z), brightness = |Ai(z)|.
Zeros: rainbow vortices, negative real axis.
x < 0: oscillatory • x > 0: decaying.
Golden lines: arg z = ±π/3 (Stokes).

z = —

Ai(z) = —

|Ai| = —

arg = —

zoom = 1×

Ai″(z) = z · Ai(z) • George Airy, 1838 • Ai(0) ≈ 0.3550