We've moved past the shortest day of the year – Dec. 21 – and, now, the days are getting longer. For more than 40 years, people have read and performed Susan Cooper's poem "The Shortest Day" to commemorate the winter solstice. In 2019, that poem was turned into a children's book, illustrated by Carson Ellis. In their collaboration, the two hoped to convey a story about light's triumph over darkness year after year. In today's episode, Cooper and Ellis join NPR's Scott Simon for a conversation about how the project came together, including the inspiration they took from their communication via letters – and from Pieter Brugel's paintings.

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