term1 light trace fossil

As we know, the relatively humidity level in the stalactite cave is usually close to 100%. So, there are lots of water droplets which contained Carbonate ion and Bicarbonate radical ion in the cave's air. I used the property of Nostoc bacteria to fossil the light trace.

At first, I used a fiber structure to hold the Nostoc Calcicola and hang it in the cave. While the light come into the cave from a small hole, the crystal will grow around the bacteria under the sunlight more than other area. During the whole day, different time have different light direction. So, the crystal will grow with the light trace on the fiber structure. Long time later, the light trace crystal will appear on the structure, just like fossil the light trace.