In other words, the reflection is right side up. Now let's walk around to the concave inner surface of our giant spoon. When you throw a ball at the top now, that downward curving angle pushes the ...

Led by Professor Dong Woog Lee in the School of Energy and Chemical Engineering at UNIST, the research team has drawn ...

The inner surface of the sculpture flips the world upside down, an optical effect that occurs when a concave reflection is viewed from beyond its focal point.