 It is on the basis of such “agglutinative” representations, exhibiting characteristics essentially different from their constituents, that apperception continues to synthesize ever more representations, a process resulting in their compression (Verdichtung) or displacement (Verschiebung) (PP II: 476–7; cf. L I: 43). The more the original associative or agglutinated representations are compressed or displaced, the more they disappear altogether from consciousness, leaving in their stead a single representation whose original composite structure has disappeared. This process, which Wundt calls “representational synthesis” proper, is reiterated at ever higher levels until even the sensory foundation vanishes, as in the case of abstract and symbolic concepts (L I: 39).