Floating Tensegrity Helix

This is a [tensegrity](https://en.wikipedia.org/wiki/Tensegrity) sculpture made of two intertwining helices. These "float" above one another without touching. There are four tensile members supporting the upper structure. The base and the top of each helix form a regular tetrahedron.

I recently saw [this tensegrity structure](https://www.reddit.com/r/3Dprinting/comments/eke8np/does_anyone_have_the_stl_file_for_this_this_seems/) made out of wooden blocks on reddit, and I was inspired to make this. However, I wanted to make it unique with the following requirements:
* Use only triangular shapes
* Use a single line / string, mainly for simplicity
* Hide the string in the structure so that it is not visible until someone looks closely

Even when someone does look closer at the sculpture to see how it is suspended, it still may be puzzling. The entire weight of the upper tetrahedron is suspended by the line in the center. The 3 lines on the corners simply keep the upper tetrah