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The following from the Japan tourism website:
The Idemitsu Museum of Arts opened in 1966 to display the works of art collected over a period of more than 70 years by Sazo Idemitsu, the founder of Idemitsu Kosan Co., Ltd. The museum provides a space where you can relax surrounded by Oriental art, with a wonderful view looking out over the Nijubashi area of the Imperial Palace.]]> http://www.ivebeenthere.co.uk/tips/2637