A man in China is said to have invented a simple folding door that can hold up to five people, as seen in the video below.
The man, surnamed Wu, has been a famous figure in China for decades, but his invention has never been fully revealed.
But the video above, released by the South China Morning Post, shows the door in action, with a man and woman sitting inside and the door opening and closing with the help of a button on top.
Wu, who is originally from the western province of Hubei, has previously shown off a variety of inventions in the Chinese capital.
The video shows the man opening a large metal door and closing it with a button that moves to reveal an opening, which he presses.
He then opens another door and pulls the button to open a door to another area of the room.
The two are then seen leaving the room and leaving the door open.
The door then closes again.
Wua’s inventions are not limited to the domestic sphere.
He has also made a series of novelty objects for his collection, including a metal folding door and a bamboo folding door.