I wondered for a long while what was so compelling to me about this technique. Fresh, different, acedemic, (the blackboard was projected by a single camera). Finally, I decided it was this....Mr. Mari was showing us his thinking, not his products.
In fact no product shots were ever shown.

To me this was infinitely more interesting than viewing "just the end result" in a pre-packed powerpoint. Admittedly his diagrams were somewhat simplistic, but the act of drawing them, stopping, expanding. erasing, backing up and then going forward, was eminently more watchable and a better vehicle for comunicating ideas, than any powerpoint I have recently seen. A true ballet of thought. Animated and completely adjustable. Of course, this was combined with random outbursts of passion and humor to make for quite a memorable evening.

Terrific lecture. Learned quite a bit.

Mark