... the projector can reproduce them on the page almost in real time. However, Flexpad has certain limitations: For the system to work, the user must stand in a specific area under the camera and projector. This means they cannot move freely around the room. "The paper performs two functions in our system," explains Steimle. "It is both a screen and an input instrument." Similar to how a mouse controls a computer, the user can interact with the device in this way. In addition to paper, other materials are also suitable, such as sheets of plastic and synthetic material. The only important thing is that they have a certain degree of malleability and flexibility.