The brain floats in our skull Almost levitating🧠 This is because the cerebrospinal fluid serves as a cushion for the brain. Why is there such an anatomical design? It protects the brain from the impact, gives it some plasticity. After all, during the collision of the skull with some object, it moves inside - this can negate the traumatic effect of not too strong blow. But if the brain were tight to the cranium - the brain injury would occur with much less traumatic force.