Here are hundreds of hands-on materials, projects, and reprducibles that develop social, cognitive, and motor skills in three-to-five year olds. Activities are organized within five centers which includes the five senses, science and nature, creative arts, numbers, and shapes, and letters.Here are hundreds of hands-on materials, projects, and reprducibles that develop social, cognitive, and motor skills in three-to-five year olds. Activities are organized within five centers which includes the five senses, science and nature, creative arts, numbers, and shapes, and letters.