Mobile Surface is a novel interaction system for mobile computing. Our goal is to bring the Microsoft Surface experience to mobile scenarios and, more importantly, to enable 3-D interaction with mobile devices. We will demonstrate how to transform any surface, such as a coffee table or a piece of paper, into a Mobile Surface by using a mobile device and a camera-projector system. Besides the Surface, we will show 3-D object imaging, augmented reality, and multiple-layer 3-D information visualization. In particular, we have developed a system with the camera-projector component to scan 3-D objects in real time while doing normal projection. To visualize, 3-D data can be projected onto a surface formed by a piece of paper while maintaining the original scale as if it were printed on that paper, and a user can interact with the projected content with a hand. Mobile Surface enables you to interact with digital contents and information around you from anywhere.