"Painting is an essentially concrete art and can only consist of the representation of real and existing things. It is a completely physical language, the words of which consist of all visible objects. An object which is abstract, not visible, non-existent, is not within the realm of painting."

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Mark Tobey fills his canvases with elliptical, calligraphic lines, beautiful whirls that seem at first glance to be completely abstract and to come from nowhere at all except his own subjective musing. But I shall never forget how struck I was, on visiting Tobey's studio one day, to see strewn around books on astronomy and photographs of the Milky Way. I knew then that Tobey experiences the movement of the stars and solar constellations as the external pole of his encounter.

— Rollo May