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Although Beuys did not create art in a deliberately abstract style, this work is reminiscent of German artist Josef Albers's series of works 'Homage to the Square', as well as of the colourful abstracts of Beuys's favourite pupil, Blinky Palermo. The use of the square here focuses attention on the simplicity of the shape and the colour, made all the more striking by the neutral cardboard background. Beuys viewed colour as a 'material', using it deliberately and sparingly. As a primary colour, blue can be used to make other colours, and is often associated with spirituality. Palermo made extensive use of blue, with spiritual connotations, in his work.