I then thought of trying again a method which I had tried many years before. This method was to take a camera obscura and to throw the image of the objects on a piece of paper in its focus – fairy pictures, creations of a moment, and destined as rapidly to fade away. It was during these thoughts that the idea occurred to me – how charming it would be if it were possible to cause these natural images to imprint themselves durably, and remain fixed upon the paper.