Kay Nielsen has tapped into my subconscious

I came across this picture randomly, with no explanation of where it was from or who did it but I knew immediately. It was from East of the Sun and West of the Moon. A book my great great aunt gave me when I was 5 when my family visited her in St. Louis. I have such fond memories of that book, and of the glossy color illustrations. So when I came across the picture I decided to get out the book (which I've always kept--now it's 82 years old) and look at it again and remind myself which story this picture came from. But it was not to be found. My book has art from an entirely different illustrator (Hedwig Collin, not the famous Kay Nielsen who did the one I pasted above). I'm completely at a loss as to why this picture exists in my memory.

For more Kay Nielsen: http://www.animationarchive.org/2005/12/media-kay-nielsen-twelve-dancing.html