undiluted emotion. It cannot logically be called abstract, because it has not been abstracted. It is the nonobjective representation of emotion, undiluted in any way. At least, that's how Rothko would put it.
“In space there are countless constellations, suns and planets; we see only the suns because they give light; the planets remain invisible, for they are small and dark. There are also numberless Earths circling around their Suns…” ~ Giordano Bruno