Here's a scene from TOS where during the '70s and '80s I didn't think anything of it but something about it had become quite noticeable by the latter half of the '90s. In "Balance Of Terror", there's a scene where Uhura has a recording of a Romulan transmission that Spock is to analyze.
So Uhura transfers the recording onto one of those little colored thingies they use that is in a slot in her console, pulls it out, gets up out of her chair, steps over to Spock, hands it to him and he takes it and sticks it into a slot in his own console which is right smack next to Uhura's own console.