that's what it is all about:
https://github.com/rafszul/possessed
here are some references:
http://bl.ocks.org/rafszul/efb1d4a4428d651c4c5e
http://padlet.com/rafszul/shadows
steps:
that's where i started with this particular route and mentors http://www.brighthub.com/internet/web-development/articles/40511.aspx