•  The nervous system is interconnected: the left side of the brain controls the right side of the body, and vice versa. 

•  There is a neural cross-wiring that connects the right and left sides of the body. 

•  Evolution has kept this device, perhaps for a benefit, but biologists don't know what it is. 

•  Mathematical approach to the problem shows that cross wiring is topologically the easiest way to avoid errors. 

•  The mapping of three-dimensional space onto a two-dimensional plane in the brain explains the interconnection of the nervous system. 

•  Geometric features arise due to changes in the geometry of the perceived world. 

•  To maintain non-overlapping connections, the brain would need to constantly flip the axis of its body maps. 

•  There is little biological research on this subject, but the scientific method can help solve perennial biological puzzles.