III. The World as Illusion

Lange asks himself the question: Where does a consistent materialism lead? Let all our mental conclusions and sense perceptions be produced by the activity of our brain, which is bound to material conditions, and our sense organs, which are also material. We are then confronted with the necessity of investigating our organism in order to see how it functions, but we can do this only by means of our organs. No color without an eye, but also no eye without an eye.