If we represent knowledge as a tree, we know that things that are divided are yet connected. We know that to observe the divisions and ignore the connections is to destroy the tree.
The human brain is genetically predisposed toward organization, yet if not tightly controlled, will link one imagerial fragment to another on the flimsiest of pretense and in the most freewheeling manner, as if it takes a kind of organic pleasure in creative association, without regard for logic or chronological sequence.