Is this time of the year and plenty of Christmas related case study start to pop up. This one is for retailer The Mills London.
This interactive window installation not only looks festive, it also does something merry, helping NGOs INT Works and Crisis, the national charity for homeless people.
The so called Wish Machine produces snow made out of tweets. Just tweet your Christmas wish to @themillwishes and it will be come one of the thousand little snowflakes. And for every tweet, 10p will be donated to Crisis.