I was thinking about light, and then I realized that if light is travelling in all directions form all sources (either emitted or reflected) everything should be merged together in a big light blob.
Take this illustration of light:
As you can see, light from the top of the head is reaching both the top and bottom of the eye. And the same goes for the toes, where light reaches both the top and bottom of the eye at the same time. As a particle/wave of brown from the top of the head is reaching the eye at the same time as the green shoes, shouldn't we be seeing something different from a clear image?
This can also be seen in a photo, if the light from the toes reaches the lens at the same time that the light from the hair does, they should be mixed. If the light is emanating from the source as a stream of particles, we should be seeing a massive light that changes color as the light reaches us at different times due to slight difference in distance.