Filla’s works in the Ostrava Gallery of Fine Art include a gouache with the title Head, which is one of the most significant proofs of the extent to which Cubism put down roots in Czech art. With its strongly geometric stylisation and the drawn architecture of the anatomical structure that respects the Cubist rule of reducing colour to grey-blue and ochre shades, the painting is well-known thanks to dozens of major exhibitions in Europe and overseas. The uncompromising application of analytical Cubist principles turns this colour of study of modest proportions into a fundamental act of the early phase of Cubist painting.