I believe in the books that I read.
This is a picture of myself taken quite a while back! I remember when I was at the beach: I lost my hairclip and my mum told me that the mermaids in the sea will have it. How much belief a child (or perhaps just me!) can have! I used to long to be a mermaid! I must have spent quite a large fraction of my childhood imagining what it would be like.