Group X, No. 3, Altarpiece1915 by Hilma Af Klint

"Curiosity about the spiritual became a lifelong interest for af Klint, as seen in "Group X, No. 3, Altarpiece," from 1915." (http://www.nytimes.com/2013/04/30/arts/artsspecial/Giving-a-Swedish-Pioneer-of-Abstract-Art-Her-Due.html?pagewanted=all&_r=1&)
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Period / movement: abstract