A Kopfzerbrecher Anchor puzzle (3rd edition) in box with a 52 page book of patterns. Kopfzerbrecher means 'Head-cracker', indicating that the tangram is a tantalising puzzle.

A tangram is a dissection puzzle of seven pieces, making either a square or rectangle. It is accompanied by a book of alternative designs in silhouette shape. Tangram puzzles were popular during the 19th century and Richter and Company in Germany produced sets of them, employing many artists to prepare the designs. Richter developed a 'stone' material from Kaolin clay, linseed oil and sand. He used the same material for his toy building blocks.

Botermans, Jack [et al.] The World of games: their origins and history, how to play them, and how to make them, New York: Facts on File, c1989

Brandreth, Gyles, Everyman's indoor games London: J.M. Dent, 1981

Hampshire Museum Service: Childhood collections. A brief history of toys: Games and puzzles

Powerhouse Museum Collections. Two anchor stone puzzles

Puzzle World: Tangram aka Kopfzerbrecher

Rob's puzzle page: Tangrams and stone puzzles

State Library of South Australia: Mortlock Wing exhibitions. To be a child August 2004-