Read H.R. Giger wanted things perfect and was tweaking with things the look till the director said stop the morning of the shoot. It became a project of passion for him.
I know this is probably something important and smart with scale he's doing here, but I could swear for all the world he's sliding his tiny astronaut down a slide and then knocking it over with a boop
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Alien probably had enough designs inspired by human anatomy. :)