It's not unusual for people to come back from Los Angeles with horror stories about violence, pollution and the sheer unmanageable size of the place. But not Reyner Banham, Professor of the History of Architecture at London University. He loves many of the things about Los Angeles that others hate, from driving on the freeways to the garish commercial art that spreads along the boulevards and over the hillsides. And tonight he explains why he believes Los Angeles is a great city and a significant one.