The Dark by Lemony Snicket, illustrated by Jon Klassen. Ive looked at this as Jon Klassen is a favourite children's book illustrator of mine, his work is child friendly but quite sophisticated in the overall look of the work he creates. In reference to the theme of my book being Pandoras Box, this book uses dark and light and the idea of fear in a child friendly way.
“Water does not resist. Water flows. When you plunge your hand into it, all you feel is a caress. Water is not a solid wall, it will not stop you. But water always goes where it wants to go, and nothing in the end can stand against it. Water is patient. Dripping water wears away a stone. Remember that, my child. Remember you are half water. If you can't go through an obstacle, go around it. Water does.” ― Margaret Atwood, The Penelopiad