III. The World as Illusion

What Lange considers to be the error of the idealistic world conception is not that it goes beyond the world of the senses and the intellect with its ideas, but that it believes it possesses in these ideas more than the individual thinker's poetic fantasy. One should build up for oneself an ideal world, but one should be aware that this ideal world is no more than poetic imagination. If this idealism maintains it is more than that, materialism will rise time and again with the claim: I have the truth; idealism is poetry. Be that so, says Lange: Idealism is poetry, but materialism is also poetry. In idealism the individual is the creator, in materialism, the species. If they both are aware of their natures, everything is in its right place: the science of the senses and the intellect that provide proofs for the whole species, as well as the poetry of ideas with all its conceptions that are produced by the individual and still retain their value for the race.