and other scientific drawings, prints and book illustrations. Despite the intense realism of individual flowers, paintings were composed from individual studies or even book illustrations, and blooms from very different seasons were routinely included in the same composition, and the same flowers reappear in different works, just as pieces of tableware do. There was also a fundamental unreality in that bouquets of flowers in vases were not in fact at all common in houses at the time – even the very rich displayed flowers one by one in delftware tulip-holders. The Dutch tradition was largely begun by Ambrosius Bosschaert (1573–1621), a Flemish-born flower painter who had settled in the north by the beginning of the period, and founded a dynasty. His brother-in-law Balthasar van der Ast (d. 1657) pioneered still lifes of shells, as well as painting flowers. These early works were relatively brightly lit, with the bouquets of flowers arranged in a relatively simple way. From the mid-century arrangements that can fairly be called Baroque, usually against a dark background, became more popular, exemplified by the works of Willem van Aelst (1627–1683). Painters from Leiden, The Hague, and Amsterdam particularly excelled in the genre. Dead game, and birds painted live but studied from the dead, were another subgenre, as were dead fish, a staple of the Dutch diet – Abraham van Beijeren did many of these. The Dutch were less given to the Flemish style of combining large still life elements with other types of painting – they would have been considered prideful in portraits – and the Flemish habit of specialist painters collaborating on the different elements in the same work. But this sometimes did happen – Philips Wouwerman was occasionally used to add men and horses to turn a landscape into a hunting or skirmish scene, Berchem or Adriaen van de Velde to add people or farm animals. Foreign lands For Dutch artists, Karel van Mander's Schilderboeck was meant not only as a list of biographies, but also a source of advice for young artists. It quickly became a classic standard work for generations of young Dutch and Flemish artists in the 17th century. The book advised artists to travel and see the sights of Florence and Rome, and after 1604 many did so. However, it is noticeable that the most important Dutch artists in all fields, figures such as Rembrandt, Vermeer, Hals, Steen, Jacob van Ruisdael,