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The Art of Halo is a collection of concept art and commentary put together by Eric S. Trautmann. The book includes a foreword by Jason Jones and a preface by Marcus R. Lehto. It was released on November 9, 2004. An updated version, Halo: The Great Journey: The Art of Building Worlds, was released on October 18, 2011.
The majority of the book focuses on the development of the major aspects of Halo: Combat Evolved and Halo 2, including the weapons, environments, and designs. There are many early sketches and concept art for these things, much of it by Shi Kai Wang and the Bungie art team. Certain sections show the influence of earlier Bungie games on Halo's design. One section is a timeline of Bungie's history, showing ideas as they evolved from a series of sketches to storyboards and animation. Finally, some screenshots are included to show how the ideas were eventually incorporated into the Halo games.
There are also many explanations for the processes and the development, such as the role of Grunt Ultras. They explain what the intentions were for many of the ideas and how the ideas changed over time.
The final section of the book contains a few full-page pinups of various concept art, including some scenes and ideas for new characters.