Here is a picture of the Masonic, phallic-looking tabernacle, which is off to the side of the "Main altar."
Glad you said it and not me! Lol! Man, when you showed me this yesterday, I hesitated to say the same thing and didn't so I could zoom in on the top part to see if Our Mother was standing on top of it. From a distance, despite my initial reaction, I thought it might be an oversized tabernacle illustrating Our Lady's Assumption, and given the name of the Cathedral would counteract my unsavory perception of it. But She is not on there from what I can see. So I kept my big neophyte mouth closed. I'm over here dying laughing because you didn't mention your thoughts on what it looked like, so we were both likely waiting for the other to say it first.

OABrownson1876's knowledge of the Church's History, travels to Catholic sites, and the number of books he's read (and owns) farrrrrr exceeds mine. Between the two of us, I am the one who would have said it out of ignorance.
My point is that two people with different knowledge, experience, and understanding thought the same thing. It now appears there is an explanation for the shape of the tabernacle. But to say he ought to do more traveling and reading made me laugh only slightly less than my comment in the paragraph above.