In the foreground you see the heaviest photo I ever made. It's a corner marker from a marocain roadside, weighin in at about 28 kg.
I coated it with light sensitiv emulsion , exposed the b/w neg using my large format camera as a projector, and sprayed the chemistry for developing and fixing, plus a lot of water onto it.

^{The picture on the wall in the background is featured in this post:
https://steempeak.com/filmphotography/@captainklaus/self-portrait-2012-analog-mural-france}