6th of august is peace day in Japan. People from all over the world send paper cranes to the Children's Peace Monument in Hiroshima as a prayer for peace.
My crane this year
And a folded crane envelope
The adress
More about Sadako Sasaki and where to send cranes: http://www.city.hiroshima.lg.jp/shimin/heiwa/crane.html
(Trad japanese model. It was not easy to find an online diagram, but this blog has a picture guide to folding it; http://getyourmesson.blogspot.com/2010/02/tato-folding.html)