This episode focuses on the eye, one of the most amazing evolutionary adaptations in the natural world. The fact that we can perceive objects that we can't touch by sensing the light that bounces off them is simply awe-inspiring. Some animals have evolved to see extremely well, others have evolved to be nearly invisible, and yet others want to be seen by everyone. This episode is about seeing and being seen. We examine penguins, tree frogs, zebras and eyespots.