With the rapid development of human-machine interaction and AI technology, designers need to shift from screen-based design thinking of graphical user interfaces to the design thinking of spatial interaction and intelligent interaction. Starting with why designers must understand technology, this book guides designers to combine technology with design thinking. Meanwhile, it interprets cross-device interaction design, AI-based design, and various sensing technologies (posture and gesture recognition, facial recognition and tracking, eye tracking, etc.) and analyzes related cases. This helps designers better respond to future work challenges.