Rainbow Rays are the mysterious force that power the T.A.R.M.O.S. Even Professor Plini himself does not know their origin (which has further fuelled rumours that it is infact an entirely unscientifically based project with no educational merit that is infact a detriment to its supposed purpose in "making learning fun"). The only known 'fact' about these rays is that it is vital to ingest Crunchy Jam to avoid their potentially rainborific damage to users of the T.A.R.M.O.S. The secrecy encircling both the T.A.R.M.O.S and Crunchy Jam has initiated the idea among hardcore viewers that Ebo and his fellow educationeers have infact been conned into beleiving they are meeting characters from different aspects of the Roman Era by Pliny and Edo when in reality they are simply being presented with slaves forced to dress up in various guises. (It should be noted that due to the hunger of Ibi this would be highly costly, and a motive seems unapparent. This could indeed be the rambling of fools.)
Ebo-Corp released the following statement about Rainbow Rays: "They are an arbitrary explanation for a nonsensical undecided object that is an excuse to bring further education into the lives of the young whilst providing a paradoxical anachronism into the quest of Ebo and his educationeers." The meaning of this sentence has not yet been fully determined.