OK. I think purpose is often not obvious. I could post a picture of any integrated circuit (designed, obviously) and its purpose will be unknown until its spec sheet is looked up using its part number. And I've seen part numbers purposely sanded off so that the chip's purpose is obfuscated.
Indeed, and this goes along another thought: a lot of people use perceived purpose as a justification for considering an item to be designed, but if purpose isn't intuitive consistently, that line of reasoning is invalid. The function of an item, thus, would not be a determinant for design.
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