 The set of circumstances invoked in the passive model and the indirectly active model to explain the lack of a conceptual determination subsequent to a perceptual episode is now invoked to explain why, although all aspects of the object appear, not all superimpositions opposite to these aspects are eliminated. In particular, Chapa identifies as an objective condition preventing the elimination of superimpositions the case when a feature is non-manifest (for instance, “non-blue” can be eliminated, but “permanent” cannot be eliminated when perceiving an impermanent patch of blue, because the feature blue is manifest, but impermanence is not). 