The practice of impermanence at the macroscopic level is simply that expounded in The Words of My Perfect Teacher on the impermanence of life, death, etc. Sometimes we examine the world outside, sometimes sentient beings; sometimes we examine the spiritual masters, and sometimes the changes in the four seasons. All kinds of phenomena can be employed in our contemplation on impermanence.Logic is not necessary in this practice. Ordinarily, we can all see the changes that go on, but we only react to the change, such as fear, when it is totally unexpected; but without practice, this feeling dissipates soon after. When changes take place with such frequency in our lives, we become numb and insensitive to them. For this reason, we must practice. By placing importance on these methods of investigation, we will easily apprehend all composite phenomena are impermanent and unreliable. The natural world outside, all material things, our own life, possessions, and reputation are all unreliable.

- Quote from The Four Seals of Dhama, "The Practice of Impermanence"