A Wrinkle in Time by Madeleine L'Engle
It was a dark and stormy night; Meg Murry, her small brother Charles Wallace, and her mother had come down to the kitchen for a midnight snack when they were upset by the arrival of a most disturbing stranger.
"Wild nights are my glory," the unearthly stranger told them. "I just got caught in a downdraft and blown off course. Let me sit down for a moment, and then I'll be on my way. Speaking of ways, by the way, there is such a thing as a tesseract."
A tesseract (in case the reader doesn't know) is a wrinkle in time. To tell more would rob the reader of the enjoyment of Miss L'Engle's unusual book. A Wrinkle in Time, winner of the Newbery Medal in 1963, is the story of the adventures in space and time of Meg, Charles Wallace, and Calvin O'Keefe (athlete, student, and one of the most popular boys in high school). They are in search of Meg's father, a scientist who disappeared while engaged in secret work for the government on the tesseract problem.
The ball scene:
Below them the town was laid out in harsh angular patterns. The houses in the outskirts were all exactly alike, small square boxes painted gray. Each had a small, rectangular plot of lawn in front, with a straight line
of dull-looking flowers edging the path to the door. Meg had a
feeling that if she could count the flowers there would be
exactly the same number for each house. In front of all the
houses children were playing. Some were skipping rope,
some were bouncing balls. Meg felt vaguely that something was wrong with their play. It seemed exactly like children playing around any housing development at home, and yet there was something different about it. She looked at Calvin, and saw that he, too, was puzzled.
"Look!" Charles Wallace said suddenly. "They're skipping and bouncing in rhythm! Everyone's doing it at exactly the same moment."
This was so. As the skipping rope hit the pavement, so did the ball. As the rope curved over the head of the jumping child, the child with the ball caught the ball. Down came the ropes. Down came the balls. Over and over again. Up. Down. All in rhythm. All identical. Like the houses.
Like the paths. Like the flowers.
Then the doors of all the houses opened simultaneously, and out came women like a row of paper dolls. The print of their dresses was different, but they all gave the appearance of being the same. Each woman stood on the steps of her house. Each clapped. Each child with the ball caught the ball. Each child with the skipping rope folded the rope.