About HG
This is Hyoung-gul Kook(HG)’s blog about study of parametric design using Rhino Grasshopper.
He is specialized in Advanced Architectural Geometry and taught as Teaching Assistant at Columbia Graduate School and Columbia/Banard College. He received his Master of Architecture from Columbia University in New York and Barchelor of Science in Architectural engineering from Yonsei University in Seoul, Korea.
Now, Hyoung-gul Kook (HG) is working at Weiss/Manfredi Architecture/Landscape/Urbanism in New York.

Hi Hyoung-gul Kook
I was very interested in your Geometry Controling Geometry but I am not able to recreate the grasshopper def. The components that I cant identify is encircled in red at (http://yfrog.com/0414code02j) and I hope that you could help me out.
Best regards
Per