Travelers are individuals who have the power to send their Light into one of six realms . The realms are parallel realities that have been described by visionaries from every faith. These worlds are separated from each other by barriers that are perceived as wind, fire, earth and air. Once a Traveler's Light finds the passageway to a realm, it will always return to the same path.

A few people are born with the ability to be Travelers and occasionally they teach themselves how to cross over to different realms. Some Travelers learn the technique from a spiritual guide called a Pathfinder . Travelers return to this world with new insights and revelations that challenge the established order. There are indications that Hildegard of Bingen , and Isaac Newton were Travelers.

Due to the extensive research done by S. Lumbroso, it is possible to make a few general conclusions about the experience of crossing over.

Before the moment occurs, Travelers enter into a particular kind of trance consciousness (as individuals gain more experience, it becomes easier to make this transition). At a certain moment, when the Traveler's body is moving slightly, the energy self appears to break out of the body. First it passes through the four barriers and then to one of five realms. Within each barrier and realm, the Traveler has to find a passageway that allows that person to make a transition back to our world. 

After analyzing hundreds of Traveler accounts, Lumbroso has stated that the description of the four barriers has stayed consistent throughout history, but the description of the realms has gradually changed. There is not a direct correlation between changes in our so-called "Fourth Realm" and the other worlds. For example, clothing styles here are not exactly duplicated there. The realms are more timeless and resistant to quick changes of fashion.

Nevertheless as our own world is transformed, there has been a corresponding alteration in the realms. The people in the other realms use modern weapons, live in buildings and drive automobiles. Travelers describe the realms as being "dreamlike," but familiar. 

If Travelers kept apart from our world, they would have a negligible effect on history. Unfortunately, their experience crossing over often impels them to challenge the existing political and economic structure. The Tabula's attempt to create an ordered society has continually been disrupted by their ideas and actions.

When reading the accounts of Travelers, it seems clear that each person enters a new realm with different cultural, religious and personal expectations. They see the experience differently and that perception invokes a wide variety of reactions. A businessman living in modern Tokyo will react to the barriers differently than a Twelfth Century nun. To summarize: while the process of crossing over has been consistent throughout history, the interpretation of that experience has continually changed.