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[1] https://en.wikipedia.org/wiki/File:No_61_Mark_Rothko.jpg
[2] https://commons.wikimedia.org/wiki/File:Amphora_protogeometric_BM_A1123.jpg, photographer: Marie-Lan Nguyen
[3] https://commons.wikimedia.org/wiki/File:Чёрный_супрематический_квадрат._1915._ГТГ.png
[4] https://commons.wikimedia.org/wiki/File:Composition-with-red-yellow-and-blue.jpg
[5] https://commons.wikimedia.org/wiki/File:Vassily_kandinsky,_improvvisazione_XIV,_1910.JPGs