The Johnson Space Center "potty cam," as it is more casually known, is an astronaut training aid. It provides a vivid, arresting perspective on something you've had intimate contact with all your life but never really seen. Perhaps not unlike viewing one's home planet from space for the first time. Positioning is critical because the opening to a Space Shuttle toilet is 4 inches across, as opposed to the 18-inch maw we are accustomed to on Earth.
The "potty cam" at the Johnson Space Center serves as a unique training tool for astronauts, offering an eye-opening glimpse into an everyday activity—using the toilet—seen from a different perspective. This tool emphasizes the significant difference in design between Earth toilets and those used in space, highlighting how astronauts must adapt to a much smaller opening on the Space Shuttle. It provides a humorous yet practical insight into a vital aspect of life in space that most people do not contemplate.