One should pay attention, when the smartest man who ever lived, with an IQ between 250 and 300 writes about philosophy. Here is a fine selection of books by the extraordinary man, William James Sidis. A January morning in 1910 hundreds of students and professors gathered in the great lecture hall at Harvard University. On stage steps up William James Sidi to present his research about the mathematics of the fourth dimension. William was just eleven years old. William James Sidis was a genius and he still has the highest IQ ever recorded, somewhere between 250 and 300.
He was able to read the New York Times when he was 18 months old and taught himself Latin and Greek. A few years later he spoke more than ten languages and wrote books on all kinds of topics.
But William was a shy person and he did not like to be in the spotlight. He broke with his family and lived alone. He took simple jobs and every time he was recognized as the wonder-child he moved on. During his life, he wrote an unknown number of books. He wrote mostly under different pseudonyms and it still is disputed what works he actually wrote, it has been speculated that a huge number of his books were never published. Read more about this topic here: Are Highly Intelligent People Less Happy?
He wrote extensively on politics, anthropology, grammar, astronomy, anatomy. He discovered black holes before anyone else but published in an obscure book. Search the animate and the inanimate. He made valuable contributions to philosophy and took on Aristotle and Heidegger and wrote treatises on history, government, economics, and political affairs and he also wrote books on public transportation and organizational structures. I suggest you read the excellent Wikipedia article about him.