Box to the Box

The box is running. The box follows after the box. The box follows after the box after the box. The box follows after the box after the box after the box. The box follows after the box after the box after the box after the box. After the box after the box Ahh... Uhm... Anyway, the box follows after the box. The reason why the box runs are to escape. (That's what they say) The boxes are going down. Only one box will reach the end. But it is known that there is nothing at the end.