man in black What does the last shot of K opening the door in Men in Black 2 mean? What does it mean?

There is a scene in which G opens a wardrobe and finds that there are many villains living in it

G, whose memory has been wiped out, tells K that he can’t believe it’s in our clothes. There can be such a world in the closet

At the end, when K opens the door, we discover that we are actually just creatures living in the closets of creatures on other planets. That’s all.