It is sunny and windy. I am sitting on the hotel terrace and watching the shifting shadows the fluttering chestnut leaves are making on the ground. Each gust of wind produces new patterns, which are blurred on the edges. But then I notice that the sharp shadow of the nearby chair is also shifting with the wind, albeit only slightly. It takes me a little while to figure out why this is so. There are a few shafts of sunlight that pass through the leaves rather than just one. However, the dominant shaft changes with the wind, thus producing slight shifts in the chair’s shadow. But it takes me a bit longer to realize that there is no “true” shaft of light in this case. The leaves actually “bend” light as it passes through the interlocked crowns of so many chestnut trees. They do not only let it pass between them, but they also reflect it. Having come to this point, I decide to write everything down before getting confused by too many discoveries.