The paper by Ivan E. Sutherland introduces a head-mounted three-dimensional (3D) display system designed to present users with perspective images that change as they move their heads. The system aims to create the illusion of 3D objects by placing suitable 2D images on the user's retinas, emphasizing the importance of kinetic depth effect over stereo presentation. The project focuses on dynamic perspective changes rather than eye rotation, measuring only the position and orientation of the optical system attached to the user's head. Key components of the system include: 1. **Special Headset**: Contains two miniature cathode ray tubes (CRTs) that magnify images to create a virtual image about 18 inches in front of each eye. 2. **Head Position Sensors**: Mechanical and ultrasonic sensors measure the user's head position and orientation. 3. **Matrix Multiplier**: Dynamically transforms information from room coordinates to eye coordinates, handling complex calculations efficiently. 4. **Clipping Divider**: Eliminates information outside the user's field of view and computes the appropriate perspective image for visible data. 5. **Analog Line Generator**: Drives the CRTs to display the transformed and clipped images. The system can display objects at various distances and positions around the user, allowing for a wide range of movements. The authors discuss the challenges of solving the "hidden line problem" and the use of homogeneous coordinate representation to handle complex 3D objects. They also describe the design and operation of the matrix multiplier and clipping divider, emphasizing their speed and efficiency. Preliminary experiments at MIT Lincoln Laboratory demonstrated the effectiveness of the 3D illusion, with users naturally moving to view different perspectives. The system's ability to handle stereo presentations and the positive user feedback on the realism of the images are highlighted. The paper concludes with acknowledgments to the team members and technical support that contributed to the project.The paper by Ivan E. Sutherland introduces a head-mounted three-dimensional (3D) display system designed to present users with perspective images that change as they move their heads. The system aims to create the illusion of 3D objects by placing suitable 2D images on the user's retinas, emphasizing the importance of kinetic depth effect over stereo presentation. The project focuses on dynamic perspective changes rather than eye rotation, measuring only the position and orientation of the optical system attached to the user's head. Key components of the system include: 1. **Special Headset**: Contains two miniature cathode ray tubes (CRTs) that magnify images to create a virtual image about 18 inches in front of each eye. 2. **Head Position Sensors**: Mechanical and ultrasonic sensors measure the user's head position and orientation. 3. **Matrix Multiplier**: Dynamically transforms information from room coordinates to eye coordinates, handling complex calculations efficiently. 4. **Clipping Divider**: Eliminates information outside the user's field of view and computes the appropriate perspective image for visible data. 5. **Analog Line Generator**: Drives the CRTs to display the transformed and clipped images. The system can display objects at various distances and positions around the user, allowing for a wide range of movements. The authors discuss the challenges of solving the "hidden line problem" and the use of homogeneous coordinate representation to handle complex 3D objects. They also describe the design and operation of the matrix multiplier and clipping divider, emphasizing their speed and efficiency. Preliminary experiments at MIT Lincoln Laboratory demonstrated the effectiveness of the 3D illusion, with users naturally moving to view different perspectives. The system's ability to handle stereo presentations and the positive user feedback on the realism of the images are highlighted. The paper concludes with acknowledgments to the team members and technical support that contributed to the project.