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since in TOS the characters sometimes all wear the same eyeshadow i've come to a few possible conclusions
everyone saw spock wearing it and decided they wanted to do they same (boring)
they all accidentally bought the exact same eyeshadow and the same store at the same time. they kept seeing each other and pretending they didn't so they wouldn't have to talk to their coworkers (slightly amusing)
everyone is actively stealing spock's eyeshadow right from his room to wear it. he has found people applying eyeshadow in his bathroom several times. he cannot get them to stop (fun)
the senior staff has meetings every morning where they do each other's make up (very fun)