We can combine colored light, creating other colors, at least in terms of visual perception. But how it the result physically "a different color" - if it is at all? Or is all this not a physical ...
When I sit in my garden during the day I always keep looking at the two intersecting shadows of two rods. It looks something like this: What I find weird about it is that at the point of ...
Imagine a photo that is taken of someone looking straight at the camera. Why when we look at the photo now from any direction it looks as if the person is looking straight at us?