A particular focus is the way we lose our grip in winter: surfaces within the lab can be
angled and the whole thing can be placed on a hydraulic
base and
tilted or jolted in any direction.
Lines xy, yz (yellow) and wy (blue) increase and
angles wyz and xyz decrease c) Cranial
base shortening (black arrow); asymmetrical shortening results in an axial
tilting of the brain.