The Institute of Militronics and Advanced Time Interventionality (Imati) is an imaginary future institution that has, in its own phrase, been " committed to time travel based research since 2005". Imati holds archives relating to the time travels of one Rosalind Brodsky, a delusional alter ego of artist Suzanne Treister. Brodsky's chrono-displacements wearing an Electronic Time Travelling Costume cause her to intersect with widely separated 20th century events (the Russian Revolution, the Second World War, the movie Schindler's List).
For a couple of years beginning in 1989, a trio of Italians made several hundred postage stamps and used them to send letters through their country's notoriously slow and inept postal service. The hand-drawn stamps tended towards the satirical and the comic: one that featured a picture of an Italian porn star called for protection of endangered species.
F.I.R.E., or First Issue Reserved Edition, is a "unique collection of U.S. postage stamps" created by a self-described "terrorist/artist living and working in New York's East Village." The F.I.R.E. web site displays its stamps under three categories: life, people, and commemoratives. Most enshrine ideas, people, or objects of American culture that would never appear on official U.S. postage stamps: guns, the homeless, friendly fire, Jack Kevorkian, Waco. A stamp commemorating the atomic bomb is captioned "shame on US".