Inventions and ghosts

"Laws of nature are human INVENTIONS, like ghosts. Laws of logic, of mathematics are also human inventions, like ghosts. The whole blessed thing is a human invention, including the idea that it ISN’T a human invention. The world has no existence whatsoever outside the human imagination…. Your common sense is nothing more than voices of thousands and thousands of these ghosts from the past."
— Robert Pirsig