The document discusses research into digital sports systems through various prototyping methods. It explores representing physical sports in both virtual and augmented spaces using simulations, visualizations, and combinations of physical and virtual elements. Five main prototypes are described that examine different approaches to creating digital versions of sports, including fully physical, fully virtual, and hybrid physical-virtual systems. The goal is to realistically simulate sports in digital form and study how to translate rules and data between the physical and virtual domains.