What fairy tale do you remember best?

If The Snow Queen, The Little Tiny or Thumbelina, The Little Mermaid, or The Princess and The Pea is one of the first coming to your mind, your childhood must have been enlightened with works by a Danish man recognised as a "national treasure" during his lifetime. 

The one fairy tale which would best describe Hans Christian Andersen’s life is The Ugly Duckling which he authored and which he himself view as somewhat autobiographical – he, a single child of poor parents only one of whom was literate, would once have a dinner with the King’s family and would find it hard to believe.

Andersen’s road was not straight, and even though he did get basic education at school, his dreams, imagination, feelings, and what he could see with his own eyes were for him of greater importance than academic knowledge.

"Imagination is more important than knowledge. For knowledge is limited, while imagination embraces the entire world."
Albert Einstein

Albert Einstein would share the same ideas about 100 years later. The scientist explained such worldview by limitations of knowledge, but what was there for a writer of fairy tales in it?