The vilasa forms are six in number. Incarnations are of two varieties, namely sakty-avesa (empowered) and amsavesa (partial). These incarnations also come within the category of prabhava and vaibhava manifestations. Childhood and boyhood are two special features of the Personality of Godhead Sri Krsna, but His permanent feature is His eternal form as an adolescent youth. The original Personality of Godhead Sri Krsna is always worshiped in this eternal adolescent form.