Toy Story 4 has done something that no previous Toy Story movie has done. Not only did Andrew Stanton and Stephany Folsom's script introduce the decidedly nontraditional toy character known as Forky (Tony Hale), it also chose to explore the mythology behind what it means to be a toy in Pixar's fictional franchise. How are they made? What gives them sentience? What separates trash from toys? And what rules does a toy have to follow simply by the nature of being a toy? These are all heady, existential questions, and you don't need to ponder the answers …