Do we need a visually perceived reality to be the subject of a painting? Can we still represent the spiritual balance of the cosmos with the most basic of color and form?

I should probably add that abstract artists often work on series and or bodies of work that explore certain subject matter, so seeing just 1 piece in that body of work may not be enough to get the full picture of what question(s) the artist is posing. If this was the only work Mondrian ever made, no one would know his name. Frankly, this is not even close to one of his best. It's just another attempt to explore the questions he's asking