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That feats of cryptography can be done using any material. Or rather I'd expect it to be a common conclusion. When you look at quipu, braille, or morse code, does nobody ever think "I wonder what random randomly assorted things might also be an embodied utterance"? Nobody looks to the colors of flowers or the patterns in sounds, they always wait until the mind seizes upon letters and numbers before they go into expect-a-message mode.
What a precocious child you must have been
Not particularly, I was slower than the average child but who happened to have a unique epiphany like every answerer here. I never understood though how people limit their expectations when it comes to communication. If the word "cryptography" here is what throws anyone off, it's not some advanced field of study, it just refers to the physical manifestation of messaging, which a child can get behind. A child will learn any form of communication you provide, from sign language, to flagging, to anything that exists that can be called "patterned" (involving any usage of any of the human senses), just not "top percentage" cryptographers in our writing-centric culture for some reason.
So UI and design
No, nothing directly to do with technology. Just regular physical representation of otherwise unwritten ideas.
Those concepts aren't exclusive to computers. Why do you think red triangles are used in road signs, or handles are only on one side of doors that open in one direction?
I'm confused then. People do think of technology sometimes when they think of cryptography, but where does that and things like road signs and door labels fall together aside from being a part of communication? Unless I misunderstand you, the characters on an ordinary sign are typically fully ordinary English.