In an earlier post here I compared the Gravity to the 1936 Stout Scarab and what appeared to me as common elements in their designs.
While looking for something else, I came across this video of Peter Jenkins, the Lucid design chief, being interviewed by Top Gear. In it he talks about his love of airplane design and its relevance for designing cars. Interestingly, the designer of the Scarab was an aeronautical engineer.
Jenkins' discussion of airplane design begins at 6:25:
There were also some shots of the Gravity rear in this video that further evoked the downward sweep and inward pinch of the rear lines of both vehicles:
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It's left me wondering whether this is just coincidence born of the common element of airplane design -- a form of convergent evolution, as it were -- or whether Jenkins was consciously influenced by Stout's work.