Nautilus Shell Growth
A nautilus shell grows outward as a logarithmic Fibonacci spiral, forming new chambers with a light-catching mother-of-pearl finish. Real nautiluses add a new, slightly larger chamber (septum) to their shell as they grow, maintaining a constant spiral proportion related to the golden ratio.

• Spiral radius grows exponentially: r = 0.15 * e^(b*theta)
• Growth factor b derived from the golden ratio phi
• Custom variable-radius tube mesh (900 segments, 20 radial)
• 22 septa (chamber walls) revealed progressively as it grows