Necessity is the mother of invention
The people living in the village are either too poor or too difficult to afford the comfort of light. So this unreceived necessity had made a man realise the problem thus, giving birth an useful invention. Therefore the statement, “Necessity is the mother of invention” is valid. The bottle of water was ordinary but the person made it epic. He used it to magnify the sunlight to brighten up the villagers home. It was definitely not impossible to make but it takes a fair amount of time.