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The medium of this work, two paintings on board, seems almost too ordinary for Beuys and very different from his work of the same period. Yet by enclosing the paintings in a specially-designed box of glass and zinc, he makes the work refer to his fascination with heat and energy. The artist used several different metals regularly in his work, with each representing different properties - zinc signifies insulation. The box is similar to the vitrines Beuys used to display selections of objects.