Knowledge is gained by understanding the theme and variations. Together, you can understand much more about each of them, by seeing the relationships between them, the variations on a theme.
Ip Rome there is a room in a church with 10,000 human skulls. One skull is kind of frightening, but 10,000 are spectacular. One skull is kind of frightening, but 10,000 are spectacular. You begin to see the structure of the human head, how much it can vary and still look like a human form. This is valid with ideas as well.