We are no strangers to discarded paper being turned into art, whether its previous life was spent as a phone book, paint chip, or a toilet paper roll. But can you tell what medium artist Nava Lubelski worked with to create these beauties?Did you guess? Tax returns and pink slips have surely never looked more lovely. The artist explains that the shredded paper rolled this way is "reminiscent of tree cross-sections where the climate of a given year, and the tree's overall age are visible in a single slice. Historical information is revealed in the colors of deposit slips, pay stubs, receipts and tax forms."