Goethe encouraged Schopenhauer to write On Vision and Colors. Schopenhauer wrote it in a few weeks while living in Dresden in 1815. After it was published, in July 1815, Goethe rejected several of Schopenhauer's conclusions, especially as to whether white is a mixture of colors. He was also disappointed that Schopenhauer considered the whole topic of color to be a minor issue.
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Schopenhauer