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@freemo Outer boundary (dashed) is the the actual boundary of the physical world. Inner boundary is what humans are able to experience using their sense.
@freemo Which is intuititely quite understandable when you realize limitations of human brain, like the ability to track 4-5 objects or numbers at a time. Or inability to clearly distinguish between numbers like 1000 and 10^17, which for an average human are simply "large".
We can be trained to overcome these limitations, but this requires precisely this - training.
@freemo Original source - so it's actually describing practical limitations of human senses https://books.google.co.uk/books?id=ZqiiwZ7zJPsC&pg=PA9&dq=%22Human+experience+of+space+and+time+in+the+physical+world.%22&hl=en&newbks=1&newbks_redir=0&sa=X&redir_esc=y#v=onepage&q=%22Human%20experience%20of%20space%20and%20time%20in%20the%20physical%20world.%22&f=false
@kravietz hard to understand what it is saying. Since you feel its self-explaining care to explain to me what its trying to say?