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| thomas schutte, 'die fremden', 1954, d9 |
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| joseph beuys, '7000 oaks', 1982-1987, d7 |
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| roman signer, 'action with sheets of paper', 20.09.1987, d8 |
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| walter de maria, construction of 'the vertical earth kilometer', 1977, d6 |
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| horst baumann, laserscape, 1977, d6 |