|A real curve on a railroad, Woodbridge, VA 2021-8|
Monday, as he recovered from breakthrough Covid, data scientist Michael Donnelly (known for work on Covid19) recommended this video by Freya Holmer, “The Beauty of Bezier Curves”.
A Bezier curve is parametric "curve" (equation graph) used in computer graphics and games.
The also occur on, for example, amusement park rides and would look nice in model railroads.
The high point is “arc length parametrization”.