All painting - the painting of the past as well as of the present - shows us that its essential plastic means were only line and color.
Piet MondrianWhat is natural does not have to be a representation of something. I'm now working on a thing that is a reconstruction of a starry sky, and yet I'm making it without a given from nature. Someone who says he uses a theme from nature can be right, but also someone who says he uses nothing at all.
Piet MondrianThe colored planes, as much by position and dimension as by the greater value given to color, plastically express only relationships and not forms.
Piet Mondrian