  The picture painted by Helmholz is plausible and appealing. If the pianist plays the note D followed by F followed by G, the pianist’s audience will have a succession of specious presents in which D is experienced as giving way to F, which in turn gives way to G. Needless to say, the details of the process differ depending on the particular form of realism: the tales told by Cinematic and Extensional theorists is relatively straightforward, while matters are rather more convoluted in the case of Retentional models.