The flight of the birds is eternal, gliding effortlessly over a wall that runs right through the middle of a vast plain with cosmic dimension. A baby is born near the wall with a heavy gate that divides an endless field. The baby grows up to become a man, who desperately longs his whole life to open the gate. Old and tired, he gives up and walks away. Suddenly, the gate opens. Although the man turns around, he does not pass through; instead, he walks away on his side of the wall.