The human brain cannot deliberately concentrate on two separate objects or ideas without eventually forming a connection between them. No two inputs can remain separate in your mind no matter how remote they are from each other. Eventually, like the tetherball, you will wind one around the other. The trick is to hold both of them in your attention and to look for relationships and connections between the two. Your attention is the restraint that helps make this a closed system. Once you become aware, you will routinely see connections between dissimilar things.
