But the difference is the channels do not use energy and they always move down their electrochemical gradient. From a high to a low potential. But membrane pumps actually use energy to actually move these molecules against their electrochemical gradient from a low potential to high potential. And this is analogous to basically moving this marker from a low potential to a high potential. So this marker will never, by itself spontaneously move from a low to high potential. To actually get it to move from here to here, I have to take this mark or move it along this line.