Your alien

"It's best-friendship at first contact after a flying saucer crashes outside a boy's house, and a Little Green Manwith a white jumpsuit and a snaggletoothed smile emerges... narration ... follows the two through the day. The boy's parents don't notice the new arrival, his classmates are mesmerized, and as for [his] teacher, she [thinks] she needsnew glasses. ... the passage of time is almost tangible in the way sunlight streams through windows or wanes as the friends race down a hill flying a kite. And when the alien'shomesickness sets in, it's light--specifically every light in the boy's house... --that attracts the attention of two green parents eager to find their child"--Publishers Weekly.