This is not a metaphor. Research shows that men are better at spotting fine detail and rapidly moving images, while women excel at discriminating between colors. (Might explain why you can tell mauve from dusty rose and he can’t get his shirt to match his pants.) And one study suggests that car guys and cat ladies might come by their fixations honestly. Those findings showed that women struggle to recognize vehicles as well as men do, but are aces when it comes to living things.