In the 5D experience Museum, David waited patiently. When May sat down, he quickly slipped from the stool to the back, opened the machine cover, and saw the computer program inside.

He held his chin up and thought for a while. Suddenly, he laughed, fingered it for a while, and soon closed the lid.

When he got back to his seat, he felt Roy. David turned his head and saw Roy. He quickly explained, “I just went to the bathroom.”

Roy did not say anything. Just then, the lights suddenly went out and the machine began to run. With the scene of the large screen in front of him, various...