 Having established this result in the case of hallucinations, dreams, sensory illusions, etc., the representationalist must find a ground for extending this conclusion to veridical perception. For in veridical perception the principle of intentionality could be preserved without appealing to ideas. One could say that the immediate object of my perception is some material thing in the world. Malebranche eliminates this possibility by appealing to the principle that all the immediate objects of perception must be of the same ontological kind. One set of perceptions cannot have ideas as their objects, while another set of perceptions is directed toward material things. If non-veridical perceptions derive their intentional character from being directed toward ideas, then so must all perceptions; otherwise this principle would be violated (see Nadler 1992, 83).