Spheres

"Spheres have the optimal surface area to volume ratio."

They are chosen specifically for their unique properties, for constructions of all kinds, including spacecraft.

News:

https://globalnews.ca/news/9640141/pentagon-ufo-video-flying-orb/

https://www.popularmechanics.com/military/aviation/a43918091/new-shape-of-modern-ufos/

https://www.livescience.com/ufo-flies-and-dives-navy-footage.html

https://www.fox10phoenix.com/news/video-shows-spherical-ufo-off-california-disappearing-into-ocean

References:

https://www.pinterest.ca/LovePeaceAccept/weird-spheres/

https://www.architecturaldigest.com/gallery/eye-catching-examples-spherical-architecture

https://vintagenewsdaily.com/the-first-spherical-building-in-the-world-16-amazing-photos-of-the-ball-house-kugelhaus-in-dresden-from-the-late-1920s/

http://www.radomeservices.com/what-is-a-radome/

https://mygeodome.com/geodesic-domes-around-world/

https://www.dpreview.com/challenges/Challenge.aspx?ID=8363

https://www.visiontimes.com/2023/01/17/spheres-mystery-and-mysticism.html