Necessity is the mother of invention.
The act of finding out or inventing; contrivance or construction of that which has not before existed; as, the invention of logarithms; the invention of the art of printing.
We invent things because they were not previously in existence. It is the very nature of the human condition that we wonder what has not been wondered before and by the power of our thoughts and the conviction of our ideas we can bring about entirely new things.
In other words, we all love to tinker, toy with ideas and just plain make stuff up.