We say information is concrete if exists in reality or is directly connected to something real, whereas if information is abstract, it exists in thought. Abstract information does not have a physical construction we can apprehend by sense, or by mechanical intermediary that delivers information to our senses. In other words, we have no way to prove that abstract information exists. In my opinion, what's abstract exists in reality, but its concrete form is imperceptible, or else we perceive the concrete form as a concept or phenomenon that bears little or no resemblance to its physical constitution.

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