 Horgan and Tienson argue for the transition from  (1)  to  (2)  by articulating in some detail how the contents of perceptual experiences, either individually or in groups, bring in their train perceptual beliefs. A key idea, supported by POI, is that perceptual beliefs and other attitudes towards perceptible contents have phenomenal characters closely associated with them. For example, there is a phenomenology of accepting various contents as true. The suggestion is that once one has a vast number of perceptual experiences with their associated perceptual contents and feelings of accepting and rejecting some of these, one qualifies as having a number of perceptual beliefs.