I am curious what a photon looks like if we could observe it pass through space. It's also supposed to be oscillation of electromagnetic field. I don't understand what that means. Is it the field gets stronger and weaker and stronger and weaker, or spreads out and shrinks etc etc? Or if it's supposed to be oscillation of a particle, wouldn't that mean that particle, already traveling at speed of light, is moving extra distances (amplitude of the wave) in space? This is supposed to be a depiction of a photon wave packet. To me it seems like oscillation of a particle in space. http://www.nist.gov/pml/div684/fcdc/quantum-physicstheory.cfm This is how I understand frequency and wavelength equation. Higher frequency means higher energy, right? Because with more energy, you can cover more distance by going up and down more. So higher energy means higher frequency, and shorter wavelength. Am I wrong? And how can we see it as a wave, if photon experiences length contraction. It should become infinitely small on its side length. And if the photon also experiences time dilation, we should see it paused in motion because time is not moving at all. So how can we see it oscillating as a wave in space when it passes by?