They built a wall around it.

A tabby cat stands on its hind legs, reaching up to a wall where a cat's face appears to be emerging from a hole, while a second cat watches from the side; the cat on the wall extends its paw through the hole, prompting the standing cat to jump and bat at it, causing the wall cat to recoil and the second cat to move closer, all within a simple indoor room with a white wall and a dumbbell on the floor.