In the middle of the screen, there is a cat running. Although he is not moving, he is cloning himself. Each clone has the same costume as the cat was switched to when it was cloned, and each clone fills the "Clones" meter. After a second, the clone deletes itself and each clone deleted makes the "Clones" meter lower.
Credits to @Scratchteam for the sprite of the cat. I made the code in this myself.