It is easy to appreciate the paintings of Markus Puskar, with their swirling colors and shapes, their out-of-this world spirituality, their blatant and primitive references to sacred practices and the human body. A close-up detail of Markus Puskar’s painting ”Float.” (Ray Mark Rinaldi, Special to The Denver Post) The oil-on-canvas works, currently on display at Denver’s Leon Gallery, vibrate like psychedelic posters from the 1960s set under a black light.