Each year Pentagram issues a small holiday book as a greeting to friends, clients and colleagues. The partners take turns researching and designing these books, which usually contain some kind of game or activity. Designed by Michael Gericke, the 2008 book is titled “A Number of Numbers” and features seven numerical systems, from simple tallying to the Burmese system consisting almost entirely of circles. Each system is accompanied by a brief explanation and a challenge, with the answers in the back. 

So tidy. The proportions are perfect.