The correct answer to this open question is the following.
The topic of my virtual exhibit is a culturally significant object, which is the Sumerian Clay tablet that includes the Solar System.
The purpose of my virtual exhibit is to inform the public that the Sumerians were a very advanced civilization that left coded messages in their clay tablets.
I would inform the public with this virtual exhibition that indeed, the Sumerians were the oldest civilization known to man. They settled in the Middle East region. Specifically, in the middle of the Euphrates and Tigris Rivers, modern-day Iraq. There they built impressive city-states such as Ur, Lagash, Kish, and Uruk.
This particular clay tablet includes 12 planets in our solar system. The incredible thing is that at that time there were no telescopes. So the question that is still intriguing scientists is how did they know the planets of the solar system and why they included 12 planets.
These Sumerian tablets were written using the cuneiform scripture.