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Beneath the explicit acts by which I posit and object out in front of myself, in a definite relation with other objects and with definite characteristics that can be observed, beneath, then, perceptions properly so-called, there is, sustaining them, a deeper function without which perceived objects would lack the mark of reality, as it is missing for the schizophrenic, and by which the objects begin to count or to have value for us. This is the movement that carries us beyond subjectivity, that places us in the world prior to every science and every verification through a sort of 'faith,' or 'primordial opinion'--or that, on the contrary, becomes bogged down in our private appearances. In this domain of originary opinion, hallucinatory illusion is possible even though hallucination is never perception...because here we are still within pre-predicative being, and because the connection between appearance and total experiences is merely implicit and presumptive, even in the case of true perception...The world remains the vague place of all experiences. It accommodates, pell-mell, true objects as well as individual and fleeting fantasies--because it is an individual that encompasses everything and not a collection of objects linked together through causal relations. To have hallucinations and, in general, to imagine is to exploit this tolerance of the pre-predicative world as well as our vertiginous proximity to all of being in syncretic experience. Thus, we only succeed in giving an account of the hallucinatory deception by stripping perception of its apodictic certainty and perceptual consciousness of its full self-possession...The perceived is and remains, despite all critical training, beneath the level of doubt and demonstration. The sun 'rises' for the scientist just as much as it does for the uneducated person, and our scientific representations of the solar system remain merely so many rumors, like the lunar landscapes--we never believe in them in the sense in which we believe in the rising of the sun. The rising of the sun, and the perceived in general, is 'real'--we immediately assign it to the world. Each perception, although always potentially 'crossed out' and pushed over to the realm of illusions, only disappears in order to leave a place for another perception that corrects it. Of course, each thing can, apres coup, appear uncertain, but at least it is certain for us that there are things, that is, that there is a world. To wonder if the world is real is to fail to understand what one is saying, since the world is not a sum of things that one could always cast into doubt, but precisely the inexhaustible reservoir from which things are drawn...Correlatively, we must surely deny perceptual consciousness full self-possession and the immanence that would exclude every illusion. If hallucinations are to be possible, consciousness must at some moment cease to know what it does, otherwise it would be conscious of constituting an illusion, it would no longer adhere to it, and there would thus be no more illusion...It is simply necessary that the self-coincidence with myself, such as it is established in the cogito, must never be a real coincidence, and must merely be an intentional and presumptive coincidence. In fact a thickness of duration already intervenes between myself who has just had this thought and myself who thinks that I have just had this thought, and I can always doubt whether that thought, which has already gone by, was really as I currently see it...But my confidence in reflection ultimately comes down to taking up the fact of temporality and the fact of the world as the invariable frame of every illusion and of every disillusion: I only know myself in my inherence in the world and in time; I only know myself in ambiguity.
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