We can't go anywhere without having numerous objects in our hands. This is a type of security for some children with autism. If they take something with them that they like....then they feel better and can adapt to their environment better. It also makes them feel more secure. It was explained to me that without their objects and securities with them, they feel naked. It would be like you leaving your house without your clothes on, or without a bra, or without your purse, etc.
Sometimes it is very hard to handle all of Trenton's objects, especially when they are big....like this puzzle.