A faceted mirror ball sprays rays of light throughout the room, but only when the ball is placed in the path of sunlight. Carter, a two-year-old boy, created this effect just before the clip began. The teacher scaffolds Carter’s curiosity by being his audience, by asking him to solve a problem, by affirming his discovery, by adjusting to simpler questions when a more difficult question is not understood by the child, by using the word “it” when she notices that he points to single spots, and by maximizing the display of the effect when she moves the ball into the patch of sunlight. This video also shows what a young child has to do to isolate the cause of an event and test a hypothesis