Stefan Kreitmayer is from both the Open University’s Centre for Research in Computing and University College London’s Interaction Centre. Stefan has a varied background developing interactive and reactive computer graphics for live performances and installations in collaboration with composers, directors, designers, and choreographers. Earlier activities included film music and sound design. Stefan tells us how this background led to the development of the 4decades simulation game. 4Decades is a game developed to enable large groups to explore and critique scientific models of global climate economics. It is based on a real-time dynamic simulation that teams interact with via distributed tablets and public displays.