Without impermanence, nothing would be possible. With impermanence, every door is open for change. Impermanence is an instrument for our liberation. The second Dharma Seal is non-self. If you believe in a permanent self, a self that exists forever, a separate, independent self, your belief cannot be described as Buddhist.
Impermanence is from the point of view of space.
When we take a step on the green earth, we are aware that we are made of air, sunshine, minerals and water, that we are a child of earth and sky, linked to all other beings, both animate and inanimate. This is the practice of non-self. Human beings' three basic afflictions are craving, hatred and ignorance. Because we are ignorant, we crave for things that destroy us, and we get angry at many things. We try to grasp the world of our projections, and we suffer.