In jest, so that you have to flip flop no longer, I'll put a whole different spin on the pyramid under consideration.
You wrote: "Is that a serpent on it?" I see 2 serpents reminiscent of, though not exactly in picture but surely in meaning, of Thoth's shape-shifters.
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No one has mentioned the peculiar male and female figures on the bottom within the pyramid, seperated by some glyphs but tied together by ropes of sort. A polarity.
The serpents can't have "solar significance" in the sense of the feathered serpent descending at Chichen Itza, because both are wearing the "white crown of divine form" (BoD), not "jugs."
The crowns are depicted suggesting that the male is accomplished, having the "bulb" on his crown the female lacks, hers having been "cut" off as the serpents seperated on top of the pyramid and rolled down in the form of a "ball" on the male side, as shown in the picture. Smile! I can't help it. Or, they havent touched wires yet for her bulb to light up. Like mine?
In any case, the scene transpires in "upper" Egypt.
Slighty different are also the serpent's heads. The head on the right, the side of the female figure, is somewhat malformed, and together with no light bulb we can say it's matter minus spirit. That would be the serpent with the "red crown" of lower Egypt in the 2 links. The male serpent head is formed nicely with eye. In the first link, the female serpent has her eye open to see eye to eye with the male serpent, but his white crown is pulled way down so as to hide the mystery.
On the female side is a pillar toped by a lotus, on the pillar of the male side I see a red dot, maybe he is finished smelling the lotus and is fire. Of course the red dot could be a glitch of sorts, but that would not change the meaning of what I just wrote.
In the first link also, a peculiar lotus protrudes from the red-crowned serpent, little bit like the "djed pillas" in the pyramid from Tanis, you think? Whereas the white crowned serpent has a "substantial" bulb in an opened lotus.
What appears to you, pardon me, to be a djed pillar in the heart of the pyramid with water, which appears to me as flowing energy, appears to be closed due to the top, which, let's say, Horus the child is about to open with a form of an adze, and the indistinguishable "lever"lifts all up to the bird with the beak of an ibis, as Thoth fecilitates the magical process depicted in this pyramid of Tanis.
These serpents symbolize polarities, I don't see a drop of water coming from the 2 eyes on either side, maybe it means we have to see "double."
Charlotte