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. Yellow is a colour which suggests warmth and sunshine. Another notable appearance of the colour in the artist's work can be found in the multiple 'Capri Battery' (1985), where the yellow suggests the sunshine of the Italian island where Beuys lived while recovering from a lung condition.