A video of a trompe-l'oeil painting. The right side of the video image shows a view of a room; the left shows a blank canvas blocking the view of the rest of the room.
Over 30 minutes, the hidden part of the room is painted in to create a complete view.
Of course there¹s no way of telling how accurate the painting portion is.
In order to make the perspective line up, the painting was made using a monitor display of the camera's view.