Plato’s Cave: see Plato’s “The Republic” (514a to 520a) or just the Wikipedia entry
Gilbert’s Barrier:
“The human soul uses reason, sees many things, investigates many more; but, however well equipped, it gets light and the beginnings of knowledge from the outer senses, as from beyond a barrier -- …”
(William Gilbert, De Magnete, 1600 AD)
Are Plato and Gilbert essentially referring to the same subjective phenomenon and the same objective reality? If so, which is more fundamental, the subjective phenomenon or the objective reality? Is there major disagreement between the two, or are they merely offering somewhat different interpretations of the same subjective evidence? Or what?
NB William Gilbert was an English physician, natural philosopher and early experimental scientist in the reign of Queen Elizabeth 1 of England. He particularly studied magnetism and wrote an influential book thereon from which comes this quotation.