I found this image online, but it shows the idea. Each point (x, t) in the barns frame corresponds to a point in the ladder's frame (x', t'). I will say that it is intuitively weird. The point when the end of the ladder enters the barn is A. The point when the front of the ladder leaves the barn is B. A and B have the same time coordinate in the barn's rest frame, but, in the ladders frame, A has a latter time coordinate than B. | I found this image online, but it shows the idea. Each point (x, t) in the barns frame corresponds to a point in the ladder's frame (x', t'). I will say that it is intuitively weird. The point when the end of the ladder enters the barn is A. The point when the front of the ladder leaves the barn is B. A and B have the same time coordinate in the barn's rest frame, but, in the ladders frame, A has a latter time coordinate than B. |