In the darkroom, Chang Kuang-he dispensed with the normal method of immersing the whole sheet of photographic paper in developer to develop a complete image. Instead he used a sponge soaked in developer, which he rubbed across the photo paper to produce a partial image.
在暗房裡，章光和捨棄將整張像紙放入顯影液完全顯影的方式，改成用海綿沾著顯影液塗抹相紙，造成局部的顯影。