The Little Island by Margaret Wise Brown

Seasons pass on the little island. One day a kitten arrives; it wants to know what is under the island, so it asks a fish. But can the kitten believe what the fish says?

This is perhaps the book we read most to my kid when he was small ... he just loved it. Margaret Wise Brown is an absolute and total genius (I think everyone should have The Important Book, Wait Til the Moon Is Full, The Little Fur Family, Mister Dog: The Dog WHo Belonged to Himself, Scuppers the Sailor Dog, The Two Little Gardeners, Goodnight Moon, The Golden Egg Book, They All Saw It, The Noisy books, and The Runaway Bunny for starters, and she lived a fabulous life—she spent her first paycheck from a book buying all the flowers from a flowercart) but this book is a particularly dreamy and beautiful meditation on change, trust, the limits of knowing, and the limitlessness of time.