I think this was a great idea. It works three fold: as a fun game, a slice of world cinema, and ultimately as a celebration of cinema. You get to see some more well known directors while some lesser known though not necessarily less important ones get exposure. I agree that David Lynch's film is probably the standout of the lot for its creativity within 50 seconds and the other rules of the game. But there are also many other interesting things going on throughout the whole exercise;weather the film is particularly entertaining or more personal, the whole project remains interesting. Other films I personally found memorable included the ones by Greenaway (also very creative, particularly his use of light), Zhang Yi Mou (sleight of hand with no special effects), Idrissa Ouedraogo and Gaston Kabore from Burkina Faso, Egypt's Youseff Chahine, to mention a few. Finally, after reading the other comments I wanted to say, instead of complaining that most of these directors showed no creativity why not think about and discuss what you yourself might film if given the chance.
Review of Lumière and Company
