Certainly, ChatGPT, like any AI, can struggle with generating truly out-of-the-box ideas due to its training on existing data. People, too, often mix and derive inspiration from others' thoughts. For instance, Einstein's theory of relativity was influenced by philosopher David Hume. In essence, there are only a handful of truly original ideas, as most concepts are built upon or inspired by existing knowledge. I am not sure if there are any ideas that do not build on former human thought.