We have a brain for one reason and one reason only - and that's to produce adaptable and complex movements.
You may reason that we have [brains] to perceive the world or to think, and that's completely wrong.
Movement is the only way you can effect the world around you . . .
There can be no evolutionary advantage to laying down memories of childhood or perceiving the color of a rose if it doesn't affect the way you're going to move later in life.
I am a movement chauvinist.