By the late 1990s, as AR became a distinct field of research, several conferences on AR began, including the International Workshop and Symposium on (Augmented Reality), the International Symposium on Mixed Reality, and the Designing (Augmented Reality) Environments workshop. Organisations were formed such as the Mixed Reality Systems Laboratory (MRLab) in Nottingham and the Arvika consortium in Germany. Also, it became possible to rapidly build AR applications thanks to freely available software toolkits like the ARToolKit. In the meantime, several surveys appeared that give an overview on AR advances, describe its problems, classify and summarise developments [17, 19, 28]. By 2001, MRLab finished their pilot research, and the symposia were united in the International Symposium on Mixed and Augmented Reality (ISMAR), which has become the major symposium for industry and research to exchange problems and solutions.