There’s an old story that once, while walking around Princeton’s campus, Albert Einstein paused to observe a water fountain and found his attention completely captivated. I think I read in a Reader’s Digest that a fellow ambler recalled seeing Einstein watching a fountain while waving his hand before his eyes, and that his fascination ultimately led Einstein to the theory of light being made up of discrete quanta that behave as both particles and waves.

I wonder what Einstein saw.

Edit: I had to remove one because I accidentally deleted one of the pictures from Photobucket.