Britta Teckentrup’s latest book for children of every age is a poetic masterpiece about the passage of time.A swing on a hill overlooking the water is at the center of this lovely meditation on childhood, growing older, friendship and loss.  “The swing has always been in this place—ever since I can remember,” declares the narrator. “Here we stood together, looking out to sea, waiting for something to change. . . for something new, something exciting. But every day was the sam