I thought you had a good novel approach. I'm not sure about a building full of people looking through their cell phones at everything, it might take them out of the space. But, I'm very intrigued with this notion of architectural space being mapped out be being visible. I like that you were able to mock up the screens on the web. I'm intrigued by the notion of painting markers onto the building that disambiguate the spaces and provide for better image recognition. I wonder if it couldn't also help human recognition - could there be a system of markings that were visible both to people and cameras that would consistently help locate yourself in space?