the shapes of alien ships have kept pace with the ability of Hollywood special effects crews to make different styles of ships and make them look realistic.
back in the 50's, all they had the technology to do was hang some plates upside down and wobble them a bit. so that's what the public expected to see when they saw something strange.
these days, and alien ship can be whatever we want it to be.
personally, i blame George Lucas and Gene Roddenberry for making our UFO sightings less uniform.
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