JohnK007 Offline Upload & Sell: Off
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Hello again, Harold.
Agree that such philosophical discussions can be stimulating ... especially since Philosophy is the degree conferred upon me by UCLA 
We disagree, though, fundamentally.
What you describe is lack of resolution + inadequate lens, rather than reality.
When shooting photographs, we operate within the limitation of the resolution of our sensor + the resolving power of our lenses. Thus, in antiquated years gone by, using inferior glass + inferior sensors, YES, as you 'blow up' the image, the finer details of what you photographed get fuzzier and fuzzier, exactly as you describe. Your conclusion is in error, however.
This phenomenon is NOT because of any lack of definition between the subject and its background; rather, it is merely the lack of resolution inherent in the sensor you are using + the lack of resolving power in the lens.
When I shot the Canon 7D +100 mm macro, six years ago, when I blew up my images to full-size, they looked terrible. I believe the resolution limit was something around 4500 megapixels on a raw file. If I blew it up to 6000 megapixels, the resolution was more horrific still.
Again, as you described, when I shrunk my images down 800 megapixels they looked "sharp" — but they were anything but when blown-up 7x this size.
By contrast, when shooting my Nikon D810, at Base ISO, and my Voigtländer SL 125mm f/2.5 APO-Lanthar Macro, the result is the opposite. I absolutely love how my images look, blown up full-size, on my color-calibrated monitor. In exactly the opposite fashion, I hate the way they look (as small jpgs) posted online. Everything is much more clearly defined in its larger form: the colors, the contrast, the detail.
WHY? Because my current D810 sensor is 10 times the sensor of the 7D, and the Voigtländer lens is 10 times the lens of the severely-outdated 100 mm macro.
I don't have time for more, but I think the phenomenon you're describing is an inequity in lens/sensor resolution over a reality in the physical world.
There are, absolutely, physical boundaries between the subject and the background.
That these clear lines become blurred at higher magnification = an indication of a substandard lens + an inadequate sensor.
By contrast, the more proficient the lens, and the greater the resolution of the sensor, the more we are able to make these clear distinctions at higher and higher magnifications ... hence the price difference between the best lenses + sensors available versus 'budget,' substandard equivalents 
That's my $0.02.
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