Brick spiral staircase - GIF

Brick spiral staircase.

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Previously:

CNC plywood spiral staircase
Lowering a concrete staircase into place - GIF
Marble staircase following vein - photo
Sandblasting a staircase to remove old finish - GIF
Staircase glass railing installation - GIF
Staircase shattered glass effect - GIF

That is a heck of a lot of unsupported mass, I would have thought at least a few rebar stringers would have been inserted in the hollows of the base bricks

Just doesn't look right, and without steel reinforcing? I wouldn't trust it to have it in my house.
Impressive how he gets those bricks to stick, must be some very quick drying cement.