I seem to remember reading somewhere that Jean Piaget once investigated his infant’s motor abilities by tying a string to the infant’s hand. By pulling the string, the infant could cause a pleasant sound to be made. The infant soon learned this action-outcome contingency, apparently demonstrating a capacity to hold an internal representation of his own action and its relationship to a desired outcome.
In the same spirit, I want to see how easily Dahlia can learn that she has the capacity to control the movement of a balloon of which the string is attached to her wrist. At 20 days, it looks to me as though she already understands something: