Homage to the Square 'Grey Question'

In 1949, Albers began his series 'Homage to the Square', whose numerous variations are based on the interactions between the colours and differently sized squares. Albers often based the titles on natural moods. According to Margit Weinberg-Staber, he considered grey to be the most beautiful colour. By using the word 'question' in the title, Albers presumably refers to the suspended state of the inner grey square in relation to the outer one. Source