  Systematic divergences between content- and vehicle-properties lie at the heart of the debate between the Extensional and Retentional approaches. Retentional theorists are committed to the claim that experiences which present us with succession or persistence are able to disguise (or conceal) their true temporal properties. Why? Because the contents of individual specious presents appear to be temporally extended even though the episodes of experiencing that possess these same contents are themselves momentary or minimally brief (as measured by clock time). This amounts to a clear-cut divergence between the temporal properties of the contents carried by specious presents, and the specious presents themselves.