All Roads lead to Rome

"Get ready for an amazing experiment! Strike the striker on the circular mark, shoot it toward the curved periphery, and witness the magic—it always returns to hit the fixed disc at the other end. How does it work? The curved periphery is shaped like an ellipse, with the circular mark and fixed disc positioned at its two foci. Just like magic, the striker, coming from one focus, is always reflected to the other by the elliptic boundary. Believe it or not, this cool property of an ellipse holds true for light rays as well. It's an ellipse extravaganza that turns simple shapes into incredible optical wonders!"