C.s. Lewis said this quote
“ But whence came this curious difference between them? He found that he could point to no single feature wherein the difference resided, yet it was impossible to ignore. One could try - Ransom has tried a hundred times - to put it into words. He has said that Malacandra was like rhythm and Perelandra like melody. He has said that Malacandra affected him like a quantitative, Perelandra like an accentual, metre. He thinks that the first held in his hand something like a spear, but the hands of the other were open, with the palms towards him. But I don't know that any of these attempts has helped me much. At all events what Ransom saw at that moment was the real meaning of gender. ”