Large wall interactive projection

Hi all,

My client is looking for a building projection on white wall aprox. 20x10 meters outdoors in Sweden.
It needs to be interactive for a small crowd of people so im thinking depth camera or kinect controlled. So the visitors should be able to interact with the projection, ether by creating patterns on the wall based on movement. Perheps something like
http://weavesilk.com/or [url]http://www.creativeapplications.net/maxmsp/ego-between-the-real-and-symbolic/[/url] or [url]Chris Milk - The Treachery of Sanctuary - YouTube

Preferebly something that has already been shown and appriciated somewhere and can be adapted to my clients wall.
I do not have time at this point to come up with a concept of my own and is therefore reaching out to you guys. Suggestions, links or offers are welcome !

Edvin