Presumably a CalTech classroom

Caltech, formally known as the California Institute of Technology is a private research university in Pasadena, California. Notable students in the series included Elliott Schwartz, Walter White, Gretchen Schwartz, and Farley.

Caltech was originally intended to physically appear in the Pilot (2005 script), in a scene where Walt visits a Mars rover exhibit, however since the the filming and setting both moved to Albuquerque, New Mexico, and the equivalent scene in what would become the aired "Pilot" was replaced with Los Alamos National Laboratory.

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