Does any body know the demo on vimeo?

Hello

I'm newbee of Kangaroo.

I found https://vimeo.com/8865054

which is the example of mixed elements in grasshopper-kangaroo.

After watching this video, i tried to make this on my own.

However i could not understand the role of green post.

Plz somebody let me know.

How to make the example.

PS. Does anybody get the example demo file icludiing .gh and 3dm?