An absurd art hoax is a hoax in which a completely unexpected object (or non-object) is presented to the public as a work of art. Something that seems absurd to describe as art, such as a blank canvas, a pile of trash, or nothing at all (invisible art). The point of the hoax is to generate a reaction of shock and disbelief, and provoke people into questioning how such a thing could possibly be considered art. So it's a seemingly absurd redefinition of art. Or a seemingly absurd extension of the boundaries of art. And eventually it's revealed to be a tongue-in-cheek joke. The hoaxer doesn't really imagine such a thing to be art. But, of course, such hoaxes explicitly raise the question of what is art. Who gets to decide what art is. And while often the crazy art is revealed by the hoaxer to be a joke. Just as often artists will continue to insist that their crazy thing (or what much of the public considers crazy) really is art. This type of hoax pokes fun at what gets considered to be art.