The document discusses Microsoft HoloLens, the first fully self-contained holographic computer. It describes how HoloLens uses advanced sensors and optics to project multi-dimensional full-color holograms that are integrated into the real world in real-time. Key aspects covered include how HoloLens works using a custom holographic processing unit, spatial sound, and is designed for comfort. Potential applications discussed are using HoloLens for storytelling, mixing holograms into the real world, and creating new possibilities for design, development and sharing ideas.