And you still hear people dismiss it as a medieval painting.
I once had dealings with the nuclear physicist who discovered some of the the most interesting ideas about the image.
He was a professor at the Air Force Academy and said that when he realized after testing the image of the face using his NASA equipment that there was only one conclusion - that the image was made at the point at which the figure came through the cloth - as in a resurrection.
That idea sure makes for some great meditation.