Things are not the shadows of ideas, nor ideas more real than things. They are identical, of the same order. Things are ideas and ideas are things.

In a hallucination my idea and its exteriorisation are not 2 things, they are one and the same thing.

Plato was wrong when he attributed to his ideas a reality different to that of things, when he did not see in each thing an idea, but found ideas only in generalities.