The IdeaFestival is a unique non-linear program designed to stretch people's horizon's and promote breakthrough thinking... utilizing multiple venues to showcase, discuss and "connect" important ideas in science, the arts, design, business, film, technology, education, etc. Among the speakers at the event in Lousiville is Teller who will ask why do we need magic tricks?  Why does every kid go through a magic phase?  And why do we cheerfully go into a theater to have someone abuse our cognitive skills?  Magic:  what good is it?  The Idea Festival takes place Sept 25 - 28.