Vita brevis, ars longa. So said Hippocrates.
"Life is short, and art long . . . "
Art exists for the ages, even as we mortals quickly turn to dust. Artists create art for many reasons. Primarily for most is the fact that they are internally compelled to create. It's an urge that's practically impossible to ignore. It haunts the artist's mind, keeps the artist awake at night, and drives them until their ideas are expressed.