A duckling is baffled by the glorious moon overhead. ""Where does it live?"" he asks his father. Father Duck refers him to the swan, sage of the pond. The swan explains simple lunar science to the duckling, most notably that a sinking moon in their sky means a rising moon somewhere else in the world. The secret of the moon's beauty is that it ""never stops sharing,"" the little one explains to Father Duck. Gantschev's watercolors, with metallic inserts and cut-aways, can be grand: A shiny argent moon reflects a snippet of metallic silver in the pond, and the cut-out view of the swan shows up in dusky silhouette. A quiet book, which here and there glistens with shards of moonlight.