How The Eyes On Mount Rushmore Were Carved 😮

He carved a deep hole inside the center of each eye, leaving a thin rod of stone behind. If he removed too much, it could break and fall off, so this was risky. But if he sculpted the faces like a Greek statue, the eyes would be left blank, making them look lifeless and dull. So by using this technique, sunlight bounced off the shaft while the rest of the iris was So by using this technique, sunlight bounced off the shaft while the rest of the iris was

covered by shadows, giving the illusion of a twinkling eye.