So recall that one main difference between air and liquid is that liquid is not easily compressed. So inside this cochlear region, if we didn't have these membranes, the pressure wave would not be able to travel because we would not be able to compress that liquid. But because of the vibrating round window, and because of the vibrating oval window, we basically have this propagated mechanical wave inside the cockpit. So if the round window or if the oval window becomes rigid, meaning it's not going to vibrate as much, that means our wave inside would not be as strong, and that implies we would not be able to hear as well. So the reason we're able to hear well is because these windows, these membranes, are flexible and they're able to oscillate and move back and forth. So as the pressure wave is carried through our cochlea, inside the cochlea, we have a region known as the organ of corte.