There are a number of different definitions of Tantra, not always mutually consistent. Robert Brown notes that the term tantrism is a construction of western scholarship, not a concept that comes from the religious system itself. This makes its independence questionable though it is generally recognized by Tantrics as different from the Vedic tradition. David Gordon White suggests its key principle is that the universe we experience is the concrete manifestation of the divine energy that creates and maintains it: Tantric practice seeks to contact and channel that energy within the human microcosm by means of ritual in order to achieve creativity and freedom.