A painting is an object which ...

A painting is an object which has an emphatic frontal surface. On such a surface, I paint a black band which does not recede, a color band which does not obtrude, a white square or rectangle which does not move back or forth, to or fro, or up or down; there is also a painted white exterior frame band which is edged round the edge to the black. Every part is painted and contiguous to its neighbor; no part is above or below any other part. There is no hierarchy. There is no ambiguity. There is no illusion. There is no space or interval (time).
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 Jo Baer

Quotes from the same author

Courage is the ability to conquer fear or despair, to be brave or have a quality of mind or temperament that enables you to stand fast in the face of opposition, hardship or danger.
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 Jo Baer
Consider paint a film of light reflecting/absorbing material, and a colored paint a material which gives a particular, characteristic transmission of light via differential absorption and reflection. Call this reflected quality 'luminance' and measure it in millilamberts. This measure is as real and present as height, breadth, depth; and I find the phenomenon equally sumptuous and convincing. . . . Painted light, not color, not form, not perspective, or line, not image, or words, or equations, is painting. I make paintings which do not represent light, they are light.
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 Jo Baer