When you were a bird you knew the fairies pretty well, and you remember a good deal about them in your babyhood, which it is a great pity you can’t write down, for gradually you forget, and I have heard of children who declared that they had never once seen a fairy. Very likely if they said this in the Kensington Gardens, they were standing looking at a fairy all the time. The reason they were cheated was that she pretended to be something else. This is one of their best tricks.

J. M. Barrie (1860–1937) Scottish novelist and dramatist [James Matthew Barrie]

The Little White Bird, ch. 16 “Lock-Out Time,” Scribner’s Magazine, Vol. 32 (1902-10)
    (Source)

This book was the first appearance of (a prototype) Peter Pan. This portion of the serial is in ch. 16 of the fully collected novel (1902), and in ch. 4 of the abridged Peter Pan in Kensington Gardens (1906).