Has anyone tried to classify what is considered to be unknowable in the physical world to define it more precisely? I can think of some basic classes of ideas and some, perhaps disputable, examples for each class.
- Lack of information transfer: What happened before the big bang? What happened on a specific day 100,000 years ago if no historical data/information exists about that day?
- Paradoxical/Self-referential: One cannot experience their own death; one cannot see one's own eyes without a reflective surface etc.
- Senses: Experiencing a spatial dimension beyond 3. Anything beyond the five senses.
- Mathematical: Godel's Incompleteness Theorem and other properties of arithmetic formal systems.
The question linked below mentions Fitch's Paradox. I'm afraid I don't have the background or understand of notation to comprehend the article at SEP. If someone could briefly summarize and explain its relevance to my question I would appreciate it.