(August 17, 2013 at 9:22 am)Esquilax Wrote: There's no reasoning involved there; we see a rock, it looks like a rock... there's a rock. Someone else sees the rock, and now we're sure the rock's not a hallucination. That's verified evidence.
What about optical illusions? Or how about this: does everything exist exactly as you see it? The sun looks perfectly spherical--are we justified in believing it is indeed a sphere? Can you confidently call a rock a rock without examining it to the last atom? Where do you draw the line between a rock and a boulder? Is that line verifiable... or do you the categories come from your head?
