Hiding Images in Plain Sight An Article by Matt Ferraro mattferraro.dev I recently made a physical object that defies all intuition. It's a square of acrylic, smooth on both sides, totally transparent. A tiny window. But it has the magic property that if you shine a flashlight on it, it forms an image. caustics
Thinking is a matter of degree Perhaps “thinking” is not a yes/no thing, but maybe it is a matter of degree. Richard Hamming, The Art of Doing Science and Engineering: Learning to Learn I Am a Strange Loop cognition