From "Dance Curves: On the Dances of Palucca,”
Wassily Kandinsky (1926)
Kandinsky's dynamic drawings are wonderfully pleasing. They underscore the beauty of the original subject as well as represent impressions that move us emotionally.
They also elegantly illustrate the principle of conceptual abstraction.
Many philosophical terms and concepts are similarly abstractions. An erudite fellow in a lecture hall can equivocate endlessly about "absolutism" and "relativism", "freedom" and "determinism", but he is not talking about the real world. He is talking about abstractions--he is talking about mere "sketches" that represent only "parts" of the real world.
Compare two-dimensional cardboard stage scenery in a theater, and picture the erudite fellow acting as though these cut-outs aren't flat pieces of scenery, but are actual buildings, real trees, three-dimensional hills hundreds of feet tall, or what have you. The lecturer can deploy all sorts of learned "examples" and "statements" (that is, effervescent terminology and exhilarating traces of cogitation concocted by other philosophers) to create the impression that these are important concepts, and he can speak and act as though his fluently equivocating upon these abstractions is discussing the real world, but the fact remains the lecturer is merely discussing abstractions--fanciful sketches that suggest or thinly evoke reality, but are actually illusions, wispy figments, evanescent nebulae, and fading imitations.
For further elaboration, see Bacon's remarks on the Idols of the Theatre in the Novum Organum, or Melville's dilation upon the images of whales in chapters 55, 56 & 57 of Moby-Dick.