I don’t wanna spoil it for you. First look at the pictures and wonder what you see. Then read below.
1h by Hans-Christian Schink uses the effect of the so-called solarization which distorts a photographic image through extreme overexposure to light, which then triggers an exact reversal of chemical processes on the light-sensitive layer of the negative. Light that is too strong causes the darkening process to weaken, so that bright areas, in this case the sun, ultimately appear dark in the final positive.