How to easy model curved and spiral stair in Rhino3D

This video is showing of transforming straight staircase to curved and spiral flow staircase. After learning and watching tutorial videos i decided to share with you guys and I believe this is very useful and make our modeling process a lot easier.
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[@dadboyrob]

Amazingly simple technique !

[@jnggraphics]

Thank you!!

[@godofsculpure]

Great idea!!

[@jnggraphics]

Thank you