This is cool! The idea of seeing because there is no light! WOW! I noticed after reading this discussion that most of the responses describe how light travels to the eye of the observer but I think your initial diagrams try to convey "the big picture" and the discussion should be about seeing what is there in the light and in the dark. With all in interest in dark matter and energy this is in my opinion pertinent. If I look through a telescope and see a shadow there must be light behind the shadow and then what could be that light? I learn something about the shadow and the light source behind it, two birds with one stone if you will. Could this be a classic EPR paradox? Mr. Box my world just got a bit larger. TY.
What a truly beautiful thought, being immersed in an ocean of light. It needs to be immortalized in an epic poem. I like your question but need some help in focusing my response. In talking about "how we see" I get the direct and reflected light into the eye, but I think you are asking for something else. I would like to discuss quantum effects and the visual centers in the brain with respect to the cones and rods in the retina but am unsure it would be relevant to the discussion. Please advise.
I would if the event was in the past. Now that you mention it the light from stars is often very old and so is in the past so maybe that is the correct view, that the field of vision narrows for light signals received. The fact that we have no access to the past except through records may make that a moot point. The only light signals that can be experienced are in the now. It is possible that each observation needs to be accompanied by a Lorentz frame.
I think the limiting factor would be the speed of light. I can see the light from the stars that outline the big dipper and they are many light years away. They are within the light cone from my vantage point. Any light signals outside my light cone would appear dark. The farther away the light source the wider the field of vision.
humans see by the light reflected from the objects around them. The fishing light casts a light and objects close by reflect light back and they can be seen. Objects further away are dimmer as the reflected light spreads and so fades until the far away objects are not discernable. the radius of the "light sphere would depend on the circumstance.