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you can discern my universe if you look at it tentively.

But what kind of representation is it?
Not a mere copy or diagram or any kind of icon.
I can tell you that the blackboard in no way resembles my universe, although in certain particulars I am going to make it so.
Neither is it a mere index or symptom of my universe by virtue of any physical connextion with it.
To be sure, it is so to some extent; since I intend by my muscular force to make certain marks on the board by which you can learn something of the characters of my universe.
But the blackboard is already and is going to be still more so, a more intellectual sort of representation of the universe, representing it by virtue of certain intelligible Principles which you and I are going to agree upon.

That is the first of these principles be this: