Mesa & Cadeira mission statement is:
" We gather talented professionals with different skills and experiences around the same table to conceive, develop and prototype solutions, in a short period of time. Every Mesa ends with a prototype ready to be launched to the world. "
I was part of the professionals that had the mission of helping São Paulo discover 300+ hidden rivers inside it's concrete streets. In a week we had our first product: an audio-tour through the course of a river in one of the most touristic areas of the city, Vila Madalena.
More info about it here: http://www.mesa.do/#morestuffwedid