In winter, men and women sheltered in strange shell-like tents patiently wait on the frozen surface of a picturesque mountain lake in central Japan. They come for Japanese pond smelt, a fish as marvelous to look at as it is tasty, especially in tempura. Catching it is not for the casual, but for the most passionate of anglers - those willing to meticulously craft their own rods or go as far as building a computer controlled fishing robot. Witness the mad enthusiasm of these innovators on ice.