The box

The other day, I ordered a large comforter from JCPenney. Jude saw the box it came in, and the box immediately became a spaceship. Then, he put it on his head, and a robot was born. Here are some pictures:
Here he is an angry alien...

...an alien hiding in his spaceship...

...becoming a robot...

...a robot...

The kid has a room filled toys...but he chose the box to play with! Why is that?