The ultimate canvas is the human form - the ultimate tools, the human mind. We each are granted but a single canvas to paint upon, to produce a masterpiece or to produce garbage. Some are granted superior canvas, or superior tools, with which to produce either masterpiece or garbage. But each has the opportunity to paint as they will. To sculpt what they will. A laugh line here - a hard muscular line there. Softness in the right place.
Or in the wrong.
Not all must appreciate the same aesthetic qualities. It is up to each of us to decide what to do with what we are granted, what qualities to pursue.
But it is an act of greatest negligence never to paint upon that canvas at all, or to splash paint upon it and call it art. An act of greatest deceit to copy another's picture upon it, or to trace another's lines, or to unroll another's painting and paste it over the canvas, to hide what is truly there.