The rocket’s fins emerge from motions that exten…（@PhilosophyOfPhy）

The rocket’s fins emerge from motions that extend around the whole curve. Each Fourier harmonic contributes a repeating oscillation; even a small corner takes many frequencies working together. One rotating chain reconstructs the horizontal coordinate, the other the vertical. Their guides meet at the pen. As the count rises from 1 to 100 harmonics per coordinate, an ellipse becomes an increasingly accurate rocket outline.