This video is about using and constructing a spinning tube that can demonstrate centrifugal force, sphere packing, and crystal structure. The BBs will form a lattice around the cylinder when a simple spin technique is applied.

More footage of water paraboloids:
   • Forming paraboloids on water  

Music:
"Our Lives Change" by Tryad
https://tryad.bandcamp.com/album/publ...
Licensed by Creative Commons:
https://creativecommons.org/licenses/...