Created by artist Walid Raad, these slices were generated from a series of (occasionally, but rarely) lovingly crafted birthday cakes for some of the world's most toxic and/or bigger-than-life leaders. The number of slices corresponds to the age of the ruler. Each slice contains a different toxin or elixir, making it unique. Festival of Gratitude was commissioned by Artwrld. License: artwrld.com/license