Circular Helix (with Slinky) Modeling Exploration within GeoGebra AR

Modeled below within GeoGebra Augmented Reality is a CIRCULAR HELIX. Parametric equations for this curve are given as follows: . a = the radius of the circle seen here. In this demo, a = 12. Also, k = 1 and t ranges from to . Other than a slinky, what other every-day real-world objects can be modeled with a circular helix?

Quick Demo