Art performs many tasks in society. Perhaps the most important is to enable people to see things that were formerly invisible, or which were brought into existence by the artist. Artists push at the envelope of social understanding, and those in the vanguard are often rewarded with scorn and calumny. The second wave of artists, treading where the visionaries have paved the way, are more able to be understood, and do a little better. At last, the idea becomes common currency and society as a whole lurches forward.