For further details on this project, check the papers:
"Hands-on Interactive Tabletop LEGO Application"
Daniel Mendes, Pedro Lopes, Alfredo Ferreira
Advances in Computer Entertainment Technology, November 2011
"Evaluation of 3D Object Manipulation on Multi-touch Surfaces Using Unconstrained Viewing Angles"
Daniel Mendes and Alfredo Ferreira
Lecture Notes in Computer Science, Vol. 6949, pp. 523-526, September 2011