collection in Brussels could emulate the King's collection in Madrid. As in the 17th century the power of a prince was no longer judged solely based on his military success, but even more so on his taste in, and appreciation of, art, the Archduke thus wanted to show that he could hold his own against the King. Teniers also painted a few gallery paintings showing artists at work or cognoscenti inspecting a collection. An example is A picture gallery with two men examining a seal and a red chalk drawing, and a monkey present (At Sotheby's New York, 24 January 2002, lot 169). These gallery paintings are heavy with symbolism and allegory and are a reflection of the intellectual preoccupations of the age, including the cultivation of personal virtue and the importance of connoisseurship. They accentuate the notion that the powers of discernment associated with connoisseurship are socially superior to or more desirable than other forms of knowing. Teniers also created an allegorical or satirical interpretation of a gallery painting in the drawing Monkeys' Masquerade: The Painter’s Studio, an Artist Seated (British Museum). The drawing is clearly a pun on the popular 'art as the ape of nature' present in many pictures of collections through the inclusion of a monkey among the art lovers. Theatrum pictorium During his tenure as keeper of Archduke Leopold Wilhelm's collection, Teniers undertook the preparation and publication of the first ever illustrated catalog of old master paintings. His brother Abraham Teniers was involved in organizing the publication of the work. The first official publication of the work in bound book format was published by Hendrick Aertssens in Brussels in 1660 (although the title page states the date as 1658). The title page of the book refers to it as 'Hoc Amphiteatrum Picturarum' ('This amphitheatre of pictures'). The publication is now often referred to as Theatrum pictorium ('Theatre of Paintings'). The cover of the Theatrum pictorium contained a bust portrait of the Archduke with a dedication to the Archduke as well as introductions in Latin, French, Spanish and Dutch. The title page clarifies that Teniers funded the publication project out of his own pocket. The Theatrum pictorium was published in four languages (Latin, French, Dutch, and Spanish) and further editions appeared in 1673 and 1688 and in the 18th century. The last edition was published in 1755. The publication comprised 246 engravings of important Italian paintings