"Colour-blindness always extends to the complementary colours. Those who are red blind are also green blind; those who are blind to blue have no consciousness of yellow. This law holds good for all mental phenomena; it is a fundamental condition of consciousness."

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The nineteenth century, utilitarian throughout, set up a utilitarian interpretation of the phenomenon of life which has come down to us and may still be considered as the commonplace of everyday thinking. ... An innate blindness seems to have closed the eyes of this epoch to all but those facts which show life as a phenomenon of utility

— Jose Ortega y Gasset