 Delius's full stylistic maturity dates from around 1907, when he began to write the series of works on which his main reputation rests.In the more mature works Foss observes Delius's increasing rejection of conventional forms such as sonata or concerto; Delius's music, he comments, is "certainly not architectural; nearer to painting, especially to the "pointilliste" style of design".The painting analogy is echoed by Cardus.