+/- = F

Schematic demonstration of the basis of analog photography analogical photography: the exposure of a negative allows to obtain a positive image, here, due to the transparency of the film we obtain directly a negative (center) which is then used to used to make a positive image (left). The third step, the watermark version of the object (right) is obtained by superimposing the negative and the positive. A tribute to Wilhelm Röntgen and his experiments that led to the discovery of to the discovery of radiography.
 
In progress.