As we read this, we stand in the plane of the present; we are the sum of all our ancestors, and the origin of all our descendents. In terms of our model, we are at an ever-changing origin, located on the boundary of past and future. As well, we are spinning with the earth, spiralling with the galaxy, and expanding or contracting with the universe. As origins, we are on the move in time and space, and all these movements have a characteristic pulse rate.

chapter 4.19 - Permaculture: A Designers' Manual (1988)