Locke- "Mind and Body III"

I was interested in reading the section on Real and Fantastical ideas. I really wanted to hear what Locke had to say about the fantastical ideas. He made a good point that we have these ideas in our head of things that really do not exist like trolls and centaurs. Its funny that these creatures only exist in fairy tales or Greek mythology, but when we hear these words we know exactly what they are. Trolls are those creatures that are hidious and live under bridges, and yet centaurs are the half human-half horse. Locke says that we don't really know if these things exist. We believe they dont, but where would someone come up with such things? Who would even think of telling people about their crazy idea of a half human-half horse, and who would continue this story? Things like that make our ideas interesting. Where did it start from? Without these "creatures" my life as a little kid probably wouldnt be so creative and fun. It's this type of thing that allows us to use our imagination. Fact or Fiction?