I have pulled out some excerpts from Sema: Human Being in the Universal Movement (Text by Dr. Celaleddin Celebi, illustrations by Ingrid Schaar) which will help to explain the Sema Ceremony of whirling. At the end it explains briefly how to twirl like a dervish and tap into the energy of nature, please read the full article with an in depth explanation here.

Sema is part of the inspiration of Mevlana Jalaluddin-i Rumi (1207- 1273) as well as of Turkish custom, history, beliefs and culture.

The fundamental condition of our existence is to revolve. There is no object, no being which does not revolve and the shared similarity among beings is the revolution of the electrons, protons and neutrons in the atoms, which constitute the structure of each of them. As a consequence of this similarity, everything revolves and man carries on his live, his very existence by means of the revolution in the atoms, structural stones of his body, by the revolution of his blood, by his coming from the earth and return to it, by his revolving with earth itself.