His first series exhibited as such was of Haystacks, painted from different points of view and at different times of the day. Fifteen of the paintings were exhibited at the Galerie Durand-Ruel in 1891. In 1892 he produced what is probably his best-known series, twenty-six views of "Rouen Cathedral". In these paintings Monet broke with painterly traditions by cropping the subject so that only a portion of the façade is seen on the canvas. The paintings do not focus on the grand Medieval building, but on the play of light and shade across its surface, transforming the solid masonry.