In the winter of 1925 ... I had been engaged in building or "tinkering" with small objects and came ... to an old box camera. I wanted to photograph my "small objects", that is, to take close-up pictures in the room in ordinary daylight. ... The box had a very old-fashioned roll film format, which was difficult to obtain. With the new instrument and new negative material, a great light dawned on me: the experiences described above began after the shackles of unsuitable material had fallen!* [504]