Simply thinking about how certain things work, one thing leads to another; I wind up at fiber optics and am reminded of a question I thought of a little more than a year ago while I was taking physics (HS). It had to do with energy, however I'm more concerned with light at the moment, so I ask this: -do/can photons interact with each other? -does light cause distortion by itself? (does light have or is it in and of itself an electromagnetic field?) -I was going to ask about intersecting light but when I 'looked' at the example in my head of perpendicular intersecting beams or lasers and I imagined an infinitely vast space between two photons of the first beam and that the perpendicular beam's photons would always end up between and never intersect with or 'touch' the photons of the perpendicular path). This leads to the next. -can two or more photons be at the exact same place at the exact same time, or would they interfere with each other and separate? If anyone is curious, the original question I mentioned that I had before was: Is there a limit to how much energy can be in one place at a time? My instructor replied no, although I'm not sure how certain they were of that answer.