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KASSEL, GERMANY - JUNE 10: In this handout photo provided by the German Government Press Office (BPA), Federal President Frank-Walter Steinmeier and his wife Elke Buedenbender and the Greek President Prokopios Pavlopoulos walk in front of the 'Pantheon of the Books' by Argentine conceptual artist Marta Minujin during documenta 14 at Friedrichsplatz on June 10, 2017 in Kassel, Germany. The 14th edition of the documenta art exhibition will be held in both Athens, Greece from April 8 - July 16 and Kassel, Germany from June 10 - September 17 and will feature works presented by over 160 international artists. (Photo by Guido Bergmann/Bundesregierung via Getty Images)

KASSEL, GERMANY - JUNE 10: In this handout photo provided by the German Government Press Office (BPA), Federal President Frank-Walter Steinmeier and his wife Elke Buedenbender and the Greek President Prokopios Pavlopoulos walk in front of the 'Pantheon of the Books' by Argentine conceptual artist Marta Minujin during documenta 14 at Friedrichsplatz on June 10, 2017 in Kassel, Germany. The 14th edition of the documenta art exhibition will be held in both Athens, Greece from April 8 - July 16 and Kassel, Germany from June 10 - September 17 and will feature works presented by over 160 international artists. (Photo by Guido Bergmann/Bundesregierung via Getty Images)
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KASSEL, GERMANY - JUNE 10: In this handout photo provided by the German Government Press Office (BPA), Federal President Frank-Walter Steinmeier his wife Elke Buedenbender and Hessian Minister President Volker Bouffier talk to Argentine conceptual artist Marta Minujin next to her work 'Pantheon of the Books' during documenta 14 at Friedrichsplatz on June 10, 2017 in Kassel, Germany. The 14th edition of the documenta art exhibition will be held in both Athens, Greece from April 8 - July 16 and Kassel, Germany from June 10 - September 17 and will feature works presented by over 160 international artists. (Photo by Guido Bergmann/Bundesregierung via Getty Images)

KASSEL, GERMANY - JUNE 10: In this handout photo provided by the German Government Press Office (BPA), Federal President Frank-Walter Steinmeier his wife Elke Buedenbender and Hessian Minister President Volker Bouffier talk to Argentine conceptual artist Marta Minujin next to her work 'Pantheon of the Books' during documenta 14 at Friedrichsplatz on June 10, 2017 in Kassel, Germany. The 14th edition of the documenta art exhibition will be held in both Athens, Greece from April 8 - July 16 and Kassel, Germany from June 10 - September 17 and will feature works presented by over 160 international artists. (Photo by Guido Bergmann/Bundesregierung via Getty Images)
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KASSEL, GERMANY - JUNE 10: In this handout photo provided by the German Government Press Office (BPA), Federal President Frank-Walter Steinmeier and his wife Elke Buedenbender talk to "inhabitants" of the work 'When We Were Exhaling Images by Germany based Iraqi-Kurdish artist Hiwa K during documenta 14 at Friedrichsplatz on June 10, 2017 in Kassel, Germany. The 14th edition of the documenta art exhibition will be held in both Athens, Greece from April 8 - July 16 and Kassel, Germany from June 10 - September 17 and will feature works presented by over 160 international artists. (Photo by Guido Bergmann/Bundesregierung via Getty Images)

KASSEL, GERMANY - JUNE 10: In this handout photo provided by the German Government Press Office (BPA), Federal President Frank-Walter Steinmeier and his wife Elke Buedenbender talk to "inhabitants" of the work 'When We Were Exhaling Images by Germany based Iraqi-Kurdish artist Hiwa K during documenta 14 at Friedrichsplatz on June 10, 2017 in Kassel, Germany. The 14th edition of the documenta art exhibition will be held in both Athens, Greece from April 8 - July 16 and Kassel, Germany from June 10 - September 17 and will feature works presented by over 160 international artists. (Photo by Guido Bergmann/Bundesregierung via Getty Images)
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Getty Images News Handout