Landscape painting was a major genre in the 17th century. Flemish landscapes (particularly from Antwerp) of the 16th century first served as an example. These had been not particularly realistic, having been painted mostly in the studio, partly from imagination, and often still using the semi-aerial view from above typical of earlier Netherlandish landscape painting in the "world landscape" tradition of Joachim Patinir, Herri met de Bles and the early Pieter Bruegel the Elder. A more realistic Dutch landscape style developed, seen from ground level, often based on drawings made outdoors, with lower horizons which made it possible to emphasize the often impressive cloud formations that were (and are) so typical in the climate of the region, and which cast a particular light. Favourite subjects were the dunes along the western sea coast, rivers with their broad adjoining meadows where cattle grazed, often with the silhouette of a city in the distance. Winter landscapes with frozen canals and creeks also abounded. The sea was a favourite topic as well since the Low Countries depended on it for trade, battled with it for new land, and battled on it with competing nations.