The fluid-filled balloon inside the bony box serves to provide further shock absorption and protection for the delicate organ, the brain.

The brain is protected by a bony box in the body. This box contains the brain and is filled with fluid, which provides additional shock absorption.

The emphasizes that activities like walking, riding a bicycle, and picking up a pencil are possible due to the cerebellum. It further suggests that without the cerebellum functioning properly, these actions would fail to take place even without conscious thinking.

The cerebellum is responsible for the precision of voluntary actions and maintaining the posture and balance of the body.

The cerebellum, a part of the hind-brain, is responsible for these activities.