Echoes of The Future

As I find myself at this University more and more, I realized that there were many hidden gems to find. One being, this location. While there is no cache at the posted cordinates, you must still visit this location and answer the question below.

Specifically, I hid this cache to showcase the amazing "Echo Chamber." Please, arrive at the site, and clap your hands in the center of this chamber. Bask in the sound of your own claps!

Now that you arrived at this location, to verify that you have, indeed visisted, answer this question.

"How many "Rectangles" border the outside circle of the Echo Chamber on the ceiling?"

Answer in a number. "12, 11, 10, 9, etc."

You can validate your puzzle solution with certitude.