Where do new ideas come from?

I think new ideas come from different situation and imagination. Our imagination could create plenty new ideas. We could come up with new ideas depend on someone's else ideas and make it more interesting and useful. For example, Thomas Edison used the idea of the first telephone's creator from Alexandra Graham Bell. Thomas Edison improved the ideas of Bell to make the sound of the telephone clearer and the network works better! New ideas also could come from moments of experience. To write a book or novel, you could use your experience to apply to your story. The main character could be you or someone that you know or really close that had a lot interesting experience. Guessing could make you come up with new ideas. Human guessing that the world is not round but it's a square. Then Galileo guessed that it's not square and that helped him come up with news ideas to find out which shape the world has. Just by a guess, Galileo changed the world's of science and the world of discovery in human world! New ideas could come from everywhere you're standing.