When I was last in Berlin Ilan Kitan introduced my wife and I to Mathias Fritz. Mathias is part of a team who mixes art and corporate mapping installation projects and in the process they developed the Tagtool, which they made available as a DIY project. Mathias had his Tagtool Mini with him and the four us played for a while. A very fun tool, it made an impression so I decided to build one. If nothing else it's a great video tool for the kids to play with.