I was very excited by the link title and disappointed by the site. Here were my reactions, roughly in order:

* Why would they show a hobo on the home page? (I'm not trying to be funny here, that is honestly what popped into my head.)

* I'm at the office, therefore I'm not going to play that video.

* Sign up for an invite? No thanks. I wish you had told me in text and images what silk is.

* I should go back to HN and write about how incredibly disappointed I am to not get any useful info from the home page. Data visualization is near and dear to my heart, and I would have liked very much to see a new app for that domain.