The science of Kabbalah explains that there is no perceptible reality at all outside us. We influence nothing outside us because we perceive nothing outside us. Outside us, there is only constant Upper Light. The entire world is within us, and we feel that we are influenced from the outside because we are created this way.
If we exit our world, we begin to see how the Upper Light gives birth to ever newer pictures of the world within us. This entire world then becomes small and restricted. We see how the Upper Light determines the way we perceive ourselves and the environment, and we ultimately begin to control this process.
Courtesy of http://www.youtube.com/watch?v=1uKPFBr_Nqc