Cubic Sphere Gazebo

Since I've had no commissions lately,I kicked this out in the last three days tapping my stockpiled materials. All recycled steel.
Height to top is 12.5 feet.
Diameter of rings 9 ft. 3 inches.
The rings are 3x3 angle and were rolled "mistakes " from the rolling mill. I bought a truckload a couple of years ago and am slowly making my way through the stack.
Only 12 bolts hold the whole structure together. It is quite stout. One can easily climb all over it with no loss of structural integrity.
Notice the pre-drilled holes in the top ring. That is for mounting add-on trellises for planting vines at each of the "corners".Not sure yet what the trellises will look like ...
The little ball finial on the top is just like:
[link]
except it's made of steel instead of stainless steel.

This is a rather large PENDENTIVE GAZEBO.
The pendentive, you may remember, was a device used by Roman builders to support domes in masonry construction, but the Byzantine architects were the ones who truly perfected it. One of the finest examples being the classic Ottoman Mosque of Hagia Sofia in Istanbul.
The pendentives, which are triangular segments of a sphere, taper to points at the bottom and spread at the top to establish the continuous circular or elliptical base needed for the dome. In masonry the pendentives thus receive the weight of the dome, concentrating it at the four corners where it can be received by the piers beneath.
Thanks to ~Dragonsmithyfor reminding me...