Important early figures in the move to realism were Esaias van de Velde (1587–1630) and Hendrick Avercamp (1585–1634), both also mentioned above as genre painters – in Avercamp's case the same paintings deserve mention in each category. From the late 1620s the "tonal phase" of landscape painting started, as artists softened or blurred their outlines, and concentrated on an atmospheric effect, with great prominence given to the sky, and human figures usually either absent or small and distant. Compositions based on a diagonal across the picture space became popular, and water often featured. The leading artists were Jan van Goyen (1596–1656), Salomon van Ruysdael (1602–1670), Pieter de Molyn (1595–1661), and in marine painting Simon de Vlieger (1601–1653), with a host of minor figures – a recent study lists over 75 artists who worked in van Goyen's manner for at least a period, including Cuyp.