This is the 'Camera obscura' effect. It was the very beginning of photography concept and is very interesting by the way. It says "Historically, it was a way for artists to quickly paint a scene as it could be projected onto a canvas and “traced”. In the time before photosensitive materials, painting was the only way to capture scenes."
"The Camera Obscura is an ancient optical device. In its most basic form it is, quite simply, a dark room with a small hole in one wall. On the wall opposite the hole, an image is formed of whatever is outside"
It says "Historically, it was a way for artists to quickly paint a scene as it could be projected onto a canvas and “traced”. In the time before photosensitive materials, painting was the only way to capture scenes."
"The Camera Obscura is an ancient optical device. In its most basic form it is, quite simply, a dark room with a small hole in one wall. On the wall opposite the hole, an image is formed of whatever is outside"