Since time immemorial, philosophers have been discussing whether the world can be viewed objectively or whether, on the contrary, there are subjective factors that could change our perception of things in the everyday world.
It is a very common mistake among mortals to think that the world is the way it is and we have to deal with it, but, objectively, there are no colors, no sounds, no smells, no flavors or textures, but rather various physical phenomena that we have to interpret.
Photons from the Sun bounce off objects and reach our eyes where specialized cells react to certain wavelengths and generate electrical impulses that are sent to our brain.
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In the same way the pressure waves generated by some objects propagate to our ears and vibrate a membrane called the eardrum and through a chain of ossicles, these vibrations are also converted into electrical impulses that are sent to the brain and the same happens with the rest of the senses.
Once in the brain, these electrical impulses mix with our experiences, education and prejudices, ultimately with our knowledge and with all this, the brain projects an interpretation of all those things that we define as reality.
In this way, before the vision of a meadow, for example, a farmer will see a plot to plant, a builder will see buildable land and ordinary mortals will see a great field to play a soccer game.
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To settle the issue, a team of researchers from Johns Hopkins University have carried out a series of experiments and have concluded that the answer is that it is impossible for humans to perceive reality objectively.
One of the tests consisted of showing the pairs of coins to the volunteers, one of them was a normal coin and the other an oval one, so that the subjects had to identify the oval one.
What seemed easy to recognize at first was not so easy, when the circular coin was turned so that the voluntary subjects were no longer able to recognize it so easily.
So you know, take a good look where you step ...
More information:
https://hub.jhu.edu/2020/06/08/objectivity-vision/