How to construct a floating staircase

How to construct a floating staircase.

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Previously:

1895 spiral staircase at the Gustave Moreau Museum in Paris - GIF
Brick spiral staircase - GIF
Concrete staircase cutting saw - GIF
High rise building staircase handrail slide - GIF
High-rise spiral emergency exit staircase - photo

How to construct a floating staircase - GIF