Why You Can Hear Someone Around a Corner but Can't See Them

In this calming long-form documentary, we follow a puzzle from ordinary life: a voice carries around a corner, yet the person speaking stays completely hidden from view. We walk through Christiaan Huygens and his 1690 treatise on waves, Thomas Young's 1803 double-slit light experiment, why a doorway bends sound, and why a shadow keeps its sharp edge. By the end the corner is no longer a puzzle, only a gentle fact about waves. Let the explanation soften, and rest. Sources: Christiaan Huygens, Treatise on Light (1690); Eugene Hecht, Optics (1974); Richard Feynman, QED (1985).