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"Just look at it". Visual proofs are not proofs. They're demonstrations. For a species that is so easily fooled by things we see, visualization cannot be taken as rigorous proof.
Even philosophy 101 can give you a ton of reasons why looking at it just isn't enough
Are you telling me that "you can see this is a triangle" ??! You can see ?? How dear you say that!
In one of my last CS classes, we did proofs and would use "by observation" for this kind of thing.
