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"Alfred Lichtwark (14 November 1852 – 13 January 1914) was a German art historian, museum curator, and art educator in Hamburg. He is one of the founders of museum education and the art education movement." - (en.wikipedia.org 31.01.2020)
(The left column lists the relations of this actor to objects in the right column. In the middle you find other actors in relation to the same objects.)