Author treats an issue on getting a new knowledge from thought experiments. A history of the notion of thought experiment is presented in a few words. Author considers a concept of instinctive knowledge, which Ernst Mach used in his investigations of the thought experiments. He puts a question on about the cultural conditionality of “instinctive knowledge”. In conclusion author makes a conjecture on the method of thought experiment as a tool for selection of the new knowledge patterns of the world.