Daniel was reading a Captain Underpants book, and in the story a villain goes back in time before anything existed in the universe. It showed the villain on a black book page for the empty universe. Daniel: "Huh, that's not what I thought an empty universe would look like, it should not be a black page, I thought it would look clear, with nothing behind it, just clear as far as the eye could see, before anything existed... you can see black as a color, it exists, it should be completely clear!".