Tong Yegeng (1828-1899), who also went by his sobriquet of "Recluse in a Minor Mountain," was a 19th century Chinese scholar-official. Later on in his life, he immersed himself in the study of Chinese calligraphy, painting and seal carving, living as a hermit after being framed and stripped of his official title. Inspired by the seven-piece tangram puzzle, he invented a new dissection of the square into fifteen pieces. He named this new puzzle "Intelligence-Enhancing Diagrams" after initially sharing the puzzle with his friends. In 1878, Tong Yegeng published two collections of his fifteen-piece tangram puzzle constructions, respectively entitled Enhancing Intelligence Diagrams and Additional Enhancing Intelligence Diagrams. These were followed by the publication of a volume on Enhancing Intelligence Banquet Table Diagrams, i.e. The Fifteen-Tangram Book in 1890. He then began to work on a project of using the fifteen pieces to form hundreds of Chinese characters, which led to the publication of Enhancing Intelligence Diagrams of One Thousand Characters.
"This book comes with a beautiful 15 piece wooden tangram puzzle and canvas bag to keep it in. The book provides a wonderful introduction which includes some history of the tangram. Then there are the shapes to make with the puzzle pieces." -Crafty Moms Share blog