I agree with Imppa on two points:
1)
opening it by looking the glyphs was purely coincidence
2)
It was not meant to be seen.
I disagree with:
It is not secret
for clearly if it was not meant to be seen, then it is a secret!
I also partially disagree with the notion that you should "forget it". If
you truly believe that this could reveal something, then I think
you should attempt it and document the results. After all: if you're not willing to test your own theory, why should anyone else?
Of the four plinths available in CM:MS, you will be able to get three into that room. Both from D05 and the one from D06. This will give you two "I" shapes and a "4" shape.