Note: This is a VR experiment, so idea is to play with the variables. Suggested steps, to utilize the simulation and learn from the changes, are:

1. Choose the copper sample and observe the variation in the contrast among grains and presence of scratches.
   
2. Brass microstructure has alpha-beta phases. The brighter dendrites are of Zn (alpha) surrounded by darker Cu (beta) matrix. Consequently, the coarser Widmanstätten microstructure is also observed, highlighting the role of heat-treatment in resulting changes in grain size.
   
3. Nodular cast iron is also provided for observation for checking the distribution of graphite nodules/spheroids in the matrix. Note the immediate surrounding region of ferrite (around graphite nodules), and presence of pearlitic matrix.
   
4. The role of heat treatment in affecting the microstructure of hypoeutectoid steel is also provided. The as-received sample can be altered by annealing and normalizing heat-treatments to obtain stress-free equilibrium microstructure or attain finer grains. Accordingly, these heat-treatment processes are utilized very judiciously in steel industries for altering microstructure.