Abstract painting in monochrome colors: black, white, grey and beige. Abstract expressionism.
Explanation of Rigpa on wikipedia:
Rigpa (Skt. vidyā; Tib. རིག་པ་, Wyl. rig pa) is a Tibetan word, which in general means ‘intelligence’ or ‘awareness’. In Dzogchen, however, the highest teachings in the Buddhist tradition of Tibet, rigpa has a deeper connotation, ‘the innermost nature of the mind’. The whole of the teaching of Buddha is directed towards realizing this, our ultimate nature, the state of omniscience or enlightenment—a truth so universal, so primordial that it goes beyond all limits, and beyond even religion itself.