Portrait painting benefitted greatly from such commissions and from the general appreciation of art by bourgeois clients, who supported portraiture as well as still-life and landscapes painting. In addition, the first significant art and dealer markets flourished in Holland at that time. With plenty of demand, Rembrandt was able to experiment with unconventional composition and technique, such as chiaroscuro. He demonstrated these innovations, pioneered by Italian masters such as Caravaggio, most notably in his famous "Night Watch" (1642). "The Anatomy Lesson of Dr. Tulp" (1632) is another fine example of Rembrandt's mastery of the group painting, in which he bathes the corpse
Nicolaes Tulp and changed his name to Nicolaes (a more proper version of the name "Claes") Tulp. He began working in local politics as city treasurer, and in 1622, he became magistrate in Amsterdam. The career of Dr Tulp matched the success of Amsterdam. As the population of Amsterdam grew from 30,000 in 1580 to 210,000 in 1650, Dr Tulp's career as a doctor and politician made him a man of influence. He drove a small carriage to visit all the patients. Thanks to his connections on the city council, in 1628 Tulp was appointed "Praelector Anatomiae" at the Amsterdam Guild of