"Realism and Naturalism rely mostly on the eye of the flesh. Abstract, conceptual and surrealistic art rely mostly on the eye of the mind. Great works of art rely on the eye of contemplation, the eye of the spirit."

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Beauty and happiness and life are all the same and they are pervasive, unattached and abstract and they are our only concern. They are immeasurable, completely lacking in substance. They are perfect and sublime. This is the subject matter of art.

— Agnes Martin