The Strange Concavity in the Great Pyramid

Ask most people how many sides the Great Pyramid has and they will say three or four....but what about eight?

Well, there are two rare moments each year, when it seems to have eight sides....on the spring and fall equinox.

Is this an optical illusion or is it for real?  If it is real, is it an intentional feature of the engineering or is there a hidden code?

Here, I would like to introduce and present my friend and fellow researcher Alan Green and what he thinks is going on with this:

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