Any philosophical, spiritual, meditative inquiry eventually comes to the conclusion that there is a presentable, formal, structural aspect to things (the External, Real, Actual) and there is an invisible, mysterious, energetic content to things (the Internal, Imaginary, Virtual). The deeper one's inquiry the more different these two worlds are revealed to be. Certain models (scientific, agricultural, bourgeois) assume that there is either no Internal (what you see is what you get) or that the Internal is a trivial private subjective concern. To discover the Internal for yourself simply sit and meditate. As the mind relaxes into compassionate quietude you realise that that quiet is far richer than anything that could possibly fill it.