Regression permits access to an understanding that was active when the current dream was invoked. In the next example, FOO ponders a thought that causes hmm to be pondered in the regression of FOO. Thus in this example, hmm is actually pondered in reality, since FOO was invoked from reality. Regression permits backwards navigation from a dream to the dream which that dream started in. The next example regresses back from FOO and then on into another dream, nap, where the thought hmm is pondered. This shows that the dream world may be visualized as having a tree structure, and thoughts may be pondered along forward, backward, and lateral pathways in that tree.