Shits of cow are collected to be formed in building blocks. A dome is built by those formed shits for dry the shits. Dried shits are to be used as fuel in daily life in the village.
This is a natural energy cycle for village people; the Sun → glass → cow → shits → fuel. It is significant in this cycle that no fossile energy is not used. This is sustainable system that has been continued from ancient era to the present and it will be survived after the perish of European/Modern industrial society.