# Can someone explain the Twin Paradox to me in lamens?

Think about a clock that looks like the game Pong. There are two horizontal parallel walls 3 feet apart and a ball that bounces vertically between the two walls. Pretend it takes 1 second for the ball to bounce from one wall to the next. Now, you put one of these contraptions on a moving plane and leave the other one on the earth. If your twin is a passenger on the plane, it still takes 1 second for the ball to bounce the 3 feet from the ground to the ceiling. Now, let’s say that you are on the ground and you could see inside the plane. The ball is bouncing from floor to ceiling, but because it is also moving relative to where you are standing, it has moved at an angle; both vertically (floor to ceiling) and it has moved horizontally (the distance the plane has moved in a second). Let’s say the distance the ball has moved relative to you is 4 feet. So, if a ball can move only 3 feet in a second. To you, it actually took the ball 1 second + the time to move the extra foot, but to your t