ABSTRACT
It is a characteristic feature of our mental make-up that the same perceptual input situation can simultaneously elicit conflicting mental perspectives. This ability pervades our perceptual and cognitive domains. Striking examples are the dual character of pictures in picture perception, pretend play, or the ability to employ metaphors and allegories. I will argue that corresponding achievements (1) share important structural properties and (2) are brought forth by a specific type of modular functional architecture in which the same sensory input can be exploited by different types or systems of conceptual forms.
