A shimmery/spooky reverie about those once-in-awile ""bimulousnights when the sky is like lace, the trees eucalyptus back and forth . . . and everything is strange and splendid and plum-purple."" A bimulous night, that's when the otters gather to sing a ""rather nasty"" song about the snails, ""the snails sulk under the cinnamon bush until the moon is high,"" and ""the thing to do is eat spaghetti with pineapple sauce"" and party with the otters all night. Cooney pictures three blond girls in empire-waist nightgowns which gives the adventure an air of prim affectation, but her moonlit gazebo, feasting and dancing otters, and wind-stirred sky are marvelous. Cooney's sweet watercolors stretch this piece of moonstruck whimsy tissue thin, but a bimulous night is still an experience worth waiting for.