Uranus, Neptune and Pluto have the role to dematerialise the fortified citadel by Saturn of the human ego and to act as agents for transformation.
Rudhyar also redefined the roles of the classical planets in astrology based on his vision of the cyclic behaviour of time. He identified Mars, Jupiter and Saturn to regulate the relation of the organism with other organisms within the same whole and Sun, Mercury and Venus referring to internal functions of the organism, Uranus, Neptune and Pluto refer to the influence from outside our solar system the galaxy.
Each of these planets contribute to transformation and transcendence of the ego. The basic challenge offered by Uranus, Neptune and Pluto is of an opposite away from Sun kind of gravitation exerted by the galactic centre. This requires a change of loyalties from the Sun ego to the galaxy unification of everything.
For this experience it is not necessary to travel in space, it is sufficient to be aware of galactic energies and to allow them to have influence. In the natal chart these transformational challenges can be analysed. Uranus refuses to accept the limitations imposed by Saturn and its main function is to keep the path to the galactic centre open.
Neptune represents the detachment from matter, demanded from everyone longing for a spiritual condition of existence. Pluto requires every living nature to put aside everything that is not part of the own essential nature. Pluto purifies, but mostly not in a gentle manner. Uranus, Neptune and Pluto actualise what was latent in our nature. Uranus can be related to vision and clairvoyance. It reveals the essence of the whole situation. Neptune brings true compassion and holiness, enlarges consciousness and enables to accept all there is simply for what it is.