If you have ever driven a car, you have probably noticed that the rearview mirror moves when you shift gears. This is because the rearview mirror is connected to the gearshift lever. When you move the gearshift lever, it causes the rearview mirror to move.
The reason for this is that the rearview mirror needs to be in the correct position for you to see behind you. When you are driving in reverse, the rearview mirror needs to be in a different position than when you are driving forward. The gearshift lever controls a cable that runs to the rearview mirror. When you move the lever, it pulls or releases the cable, which moves the rearview mirror.