A unique piece, only this one is for sale. The air you are purchasing is like buying an endless tank of oxygen. No matter where you are, you always have the ability to take a breath of the most delicious, clean-smelling air that the earth can produce. Every breath you take gives you endless peace and health. This artwork is something to carry with you if you own it. Because wherever you are, you can imagine yourself getting the most beautiful taste of air that is from the mountain tops or fields or from the ocean side; it is an endless supply.
Now that sounds perfect for that big blank wall in your office, right? In case you're worried that you're getting ripped off, the museum assures you that its works are completely real. In a sense:
Although the artworks themselves are not visible, the descriptions open our eyes to a parallel world built of images and words. This world is not visible, but it is real, perhaps more real than the world of matter, and it is also for sale.
http://www.npr.org/blogs/thetwo-way/2011/07/19/138513048/woman-pays-10-000-for-non-visible-work-of-art?ft=1&f=1001&sc=tw and Official Website -via Geekosystem
Photo (unrelated) via Flickr user Leonski used under Creative Commons license
Check it out sometime - fascinating and awful. Why do you think some canvasses are worth millions? It's not the paint. It's the fact that you can sink an arbitrarily huge amount of money into an object.
As long as there are people to buy...