Spiral oak
Wedge treads around a single centre.
Looking down the well. Each tread is a pie. The rail is the circle that keeps them honest.
A spiral is geometry first. Frame three is two wedges and the seam between them.
If you want this
The price is written after we measure
A senior estimator measures the subfloor and the material, and the number that comes back is fixed in writing. Stairs are quoted as their own line, because they are their own job.
More of this work at hardwood stairs in Toronto, the visual library.