The red arrow is pointing to the bright structure within the dark gray structure.What anatomy is indicated by the arrow? 
Definitions:
Blue-collar Jobs
Occupations that typically involve manual labor or skilled trades.
Virtual Reality
A computer-based technology that provides an interactive, three-dimensional learning experience.
Three-dimensional Learning Experience
An instructional approach that integrates three key dimensions: disciplinary core ideas, science and engineering practices, and crosscutting concepts, to provide a comprehensive learning experience.
Behavior Modeling
A training technique that involves learning through observation and imitation of others’ behaviors, which are demonstrated as a way to teach effective skills.
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