Virtual reality in physics. Computer-generated wire-frame drawing showing a cut-away view of the ATLAS particle detector to be built at the CERN European particle physics laboratory. The ATLAS experiment will service two accelerator rings; the proposed Large Hadron Collider (dark blue pipe) and the existing Large Electron-Positron ring (grey and yellow). A figure (red) is shown in the lower right for scale. This image was made using CERN's VENUS virtual reality system. It is used to check engineering designs for fit and position before any component is actually manufactured; this process is called virtual prototyping. Compare with space-filled version, T490/163.