The sphere was an alien object which gave a person the power to manifest his thoughts. Well and good, except that human beings had a split in their brains, a split in their mental processes. It was almost as if men had two brains. The conscious brain could be consciously controlled, and presented no problem. But the unconscious brain, wild and abandoned, was dangerous and destructive when its impulses were manifested.
Jeff Hawkins talks about this in "A Thousand Brains" :)
