Perhaps I should investigate more before asking. One of the labels on the 
video took me to www.processing.org, an open source programming language to 
create images, animations and interactions.

From here come the brick buildings
http://www.processing.org/learning/3d/bricktower.html

The code to generate collisions or is a little hard to find or is due to the 
secret talent of Mr. Bollinger.
regards
B. Gimeno

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