How does he do it?

As we were on our way to the cinema to see (Mr.) Greenberg, we ran into Mr. Ramana, on het 'Leidse Plein', last week.
Well... we didn't actually run into him, or he would have toppled over but we did 'skirt around him'.
There were many of 'us onlookers', trying to figure out how he did it (some in very inventive ways). It was quite fun to watch and, trick or no trick, the guy managed to sit still in the same position for a looooooooooong time, which in itself is quite a feat.

So here he is (click on photo's for clearer picture).