M. Night Shyamalan’s “Signs” is the work of a born filmmaker, able to summon apprehension out of thin air. When it is over, we think not how little has been decided, but how much has been experienced. Here is a movie in which the plot is the rhythm section, not the melody. A movie that stays free of labored explanations and a forced climax, and is about fear in the wind, in the trees, in a dog’s bark, in a little girl’s reluctance to drink the water. In signs. — Roger Ebert