The DigitalDesk is a physical desk that integrates electronic features to enhance paper documents. It allows users to interact with paper in a way that combines the tactile benefits of physical documents with the computational capabilities of computers. The desk projects images onto paper and can recognize paper documents, enabling users to perform tasks such as selecting and moving paper-based objects, entering numbers into calculators, and editing sketches. The DigitalDesk supports both paper and electronic interaction, allowing users to work with documents in a more natural and efficient manner. The DigitalDesk has three main characteristics: it projects electronic images onto paper, it responds to interaction with pens or fingers, and it can read paper documents placed on the desk. These features enable a range of applications, including a calculator that allows users to select numbers from paper documents, a drawing application that enables users to edit and move paper-based sketches, and a shared editing system that allows users to collaborate on paper documents from different locations. The DigitalDesk addresses the limitations of both paper and electronic documents by combining their strengths. It allows users to take advantage of the tactile and visual benefits of paper while also benefiting from the computational power of computers. This integration of paper and electronic interaction has the potential to improve the efficiency and effectiveness of document handling in both personal and professional settings. The DigitalDesk is an example of a computer-augmented environment that enhances paper documents with computational capabilities. It allows users to work with paper documents in a more natural and intuitive way, combining the best of both worlds. The system has been tested with various applications, including a calculator, a drawing application, and a shared editing system, demonstrating its potential for improving document handling and collaboration. The DigitalDesk represents a significant step towards integrating paper documents into the electronic world of personal workstations, making paper-based information more accessible to computers.The DigitalDesk is a physical desk that integrates electronic features to enhance paper documents. It allows users to interact with paper in a way that combines the tactile benefits of physical documents with the computational capabilities of computers. The desk projects images onto paper and can recognize paper documents, enabling users to perform tasks such as selecting and moving paper-based objects, entering numbers into calculators, and editing sketches. The DigitalDesk supports both paper and electronic interaction, allowing users to work with documents in a more natural and efficient manner. The DigitalDesk has three main characteristics: it projects electronic images onto paper, it responds to interaction with pens or fingers, and it can read paper documents placed on the desk. These features enable a range of applications, including a calculator that allows users to select numbers from paper documents, a drawing application that enables users to edit and move paper-based sketches, and a shared editing system that allows users to collaborate on paper documents from different locations. The DigitalDesk addresses the limitations of both paper and electronic documents by combining their strengths. It allows users to take advantage of the tactile and visual benefits of paper while also benefiting from the computational power of computers. This integration of paper and electronic interaction has the potential to improve the efficiency and effectiveness of document handling in both personal and professional settings. The DigitalDesk is an example of a computer-augmented environment that enhances paper documents with computational capabilities. It allows users to work with paper documents in a more natural and intuitive way, combining the best of both worlds. The system has been tested with various applications, including a calculator, a drawing application, and a shared editing system, demonstrating its potential for improving document handling and collaboration. The DigitalDesk represents a significant step towards integrating paper documents into the electronic world of personal workstations, making paper-based information more accessible to computers.