 Some animation is employed in the film to show the coming and going of the Ice Age when the lakes were born, but most of the other episodes of lake history are suggested by camera tricks that affect the canoeist and so emphasize the change.There is, for instance, a scene where open water suddenly turns to ice, freezing the canoe in mid-paddle.Then the canoe is left in midair high above the water, illustrating the melting of the ice, and causing the canoeist to crash to the water below.