Abstract: In some embodiments, a computer system applies a time of day setting to a virtual environment. In some embodiments, the time of day setting is updated based on an event. In some embodiments, a computer system displays content in an expanded display mode. In some embodiments, computer systems join a communication session while maintaining display of respective environments. In some embodiments, a computer system moves a portal based on user movement. In some embodiments, computer systems share a virtual environment. Computer systems can display media with simulated lighting. Computer systems can share an environment. In some embodiments, a computer system selects a position relative to content. A computer system can present representations of communication session participants based on content. A computer system can present user interfaces to control visual appearances of an environment including media. Computer systems can change an appearance of an environment based on environmental modes.

Abstract: A volumetric detection system (or leak tester) is disclosed herein. While the system can have any suitable feature, in some cases, it includes a displacement mechanism (such as a programmable stepper motor), a controllable element (such as a piston) that is coupled to the displacement mechanism, a containment chamber that receives a portion of the controllable element, a sensing unit (or sensor) that is configured to measure a backpressure from a device that is being tested, a computational unit (or processor) that is configured to determine a placement of the controllable element within the chamber, and a coupler (or attachment mechanism) that is configured to couple to the device that is to be tested. In some cases, the system functions without being coupled to a compressed air source. Other implementations are described.