A 3D composite is created by plotting the colors of each pixel in a composite image on a 3D graph, mapping RGB values to XYZ positions.
Many of the video composites produce shapes in 3D. For example, BREADTH is an atom-like shape with nested spheres of increasingly higher density, surrounded by 3 rings. And JALVINSACH has the outline of some cubes.

The “path=” file can be changed to any other .stl file on tomasf’s website:
http://tomasf.se/projects/semi/stl.html?path=(NAME OF COMPOSITE)_composite3D.stlLike http://tomasf.se/projects/semi/stl.html?path=BREADTH_composite3D.stl
Slower, but with color and alternate viewing modes: https://unfavorablesemicircle.github.io/3d-viewer/
3D composites can also be produced with MATLAB or Octave.
Some 3D composites seem to contain an arrow shape similar to the ♐ symbol for Sagittarius. It is unknown if this is intentional but it could be representing the Sagittarius (latin for archer) arrow which appears so often in video titles.