The Tracker Trail website contains information on wilderness survival skills, tracking and nature, from the viewpoint of the ancient philosophy of living in harmony with the Earth, which is what might be called “wilderness mind”…After having “played” with ice lenses last winter, I decided to push a little deeper in trying to perfect this form of fire-starting. These are the things I looked at: Getting Clear Ice,  How a Lens works and the Properties of a Good Ice Lens