What it’s a tube? Tube are a cylindrical from that is measure for radios, the basic concept says to what is tube, but for What the tube was make it?
More of the structures have a skeleton to make easier created volume also make it more stable, for this reason why in construction I’ll used the tube, for example if you want a car toy:
You can make a bicycle:
I don’t know a Dome:
Of course, that the stability of the skeleton it depends of the material https://theproductlaunchcompany.com/blogs/news/about-materials , do you want try with our material, Check our tubes.