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TOKYO, JAPAN - JULY 2 : A ninja's weapon on display during a ninja exhibition that kicks off Saturday at Miraikan in Tokyo, Japan on July 2, 2016. A special exhibition entitled “The Ninja- who were they?” will be open from July 2 (Saturday), 2016 to October 10 (Monday) 2016 at the Miraikan (National Museum of Emerging Science and Innovation). 

Photo: Richard Atrero de Guzman

https://www.miraikan.jst.go.jp/en/spexhibition/ninjya/