This is quite simple: Amnesty International has been calling on top-level contemporary artists to create amazing poster art for 50 years. From Picasso and Calder, to Miró and Cieslewicz. This year, 2011, marks the 50th year of the orgainization, founded in London in 1961, and they just released their 2011 poster.

Thanks to the London Guardian for compiling the posters.

Here is the 2011 poster:





















The Picasso poster: