a person who is retarded my not be able to understand universal concepts but that doesn't mean they're completely disconnected with the world around them. A person who is insane may be out there but they may also be absolutely brilliant at the same time. Some of the worlds most intelligent people have been schizophrenic or just completely batshit insane. Howard Hughs thought he could see the germs that invested this world, yet he was on of the greatest aviators and businessmen from the last century. John Forbes Nash jr was an amazing mathematician and economist who believed that a CIA agent was giving him orders, the agent was not a real person. He aslo thought the soviets where trying to kill him, but that was yet another delusion. And there was another example, there was one guy who helped create the first observatory, the first large telescope that could see vast distances in space he was truly a visionary for the astronomy community... yet he believed that a little imp followed him around everywhere he went. I believe that was George Ellery Hale, though I'm not entirely sure.