Optics is an example of the different ways a human is able to see things in the world. The same goes for the color of a person's skin and even though optics present that there are differences in color, these do not state that they should necessarily be treated as different.

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Quote text and notes from Wikiquote: Edward Bouchet (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.