(Click drawing to expand)
This rendering is a free standing stair that has a very- tight inside radius with straight treads morphing into bow-shaped treads.
This staircase has a large radius with bow-shaped treads all the way down. Note: At the stair's base it must conform to an odd shaped wall.
Spirals are always difficult to position so it is very important that they be laid out first so the client can determine if they like how the stair starts at the top and ends at the bottom.
Spirals aren't always round on the outside curve so it is important that the client can visualize what the stair will look like before it is built.