Artwork that is not realistic, though often based on an actual subject. Remember Picasso? Reduced, simplified, removal of detail.
The very diverse late 19th and early 20th century movement towards less objective or totally subjective art. Art for art's sake. Remember Duchamp's urinal?
Subtractive Sculpting Method/Process
Subtractive process: cutting of a form, figure or design out of a solid material such as a block of stone or wood. Cutting away material. Michaelangelo used a pointing device early on in his artistic career. Towards the end of his life he no longer needed such assistance.