Wheel in the middle of a wheel?

Ezekiel 1:16 This was the appearance and structure of the wheels: They sparlled like chrysolite, and all four looked alike. Eack appeered to be made like a wheel intersecting a wheel.

Wooden machinery used to raise blocks of stone for Giza Pyramid construction.

A wheel within a wheel is literally a LOBE.

Take two coins the same diameter and place one coin exactly on top of the other for a round, wheel or circular shape.

Now move the top coin aside just a little (a coin intersecting a coin) for the shape of a Lobe.

Ezekiel's vision is about Giza Pyramid construction and the wheel intersecting wheel machines are the four-lobe pinion-pulleys raising stone to build a throne for a god.

google four-lobe pinion-pulley

for more literal meaning of Ezekiel's vision.