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Don't mind Otherside and Hamr they didn't catch the symbolism and yes it's right there and you explained it well.
This checkered floor can be seen in many films, most notably - The Matrix where Neo is walking up the flight of stairs where he meets morpheus (for the first time) to enter the real world (dimension) and the floor pattern of the stair is..yes the checkered floor.
This episode deals with the Checkered Floor, its many meanings and its relationship to summoning entities.
I've given 100+ hours studying 911.
it was purposely Masonic.
my very robust critique