Our quest for our Probability Engine and its talismans has occupied many major units even of our own time. We have prosecuted it with diligence, because we were aware of the dangers that might arise if the engine were misused. We built several similar engines to aid us in the search, but it turned out that the catastrophe in our cosmos which swept away the engine and cast one of the talismans up on your time-stream and planet, was of an unknown sort, making the route of the talisman an untraceably random one. We would have attempted a canvass of reality, except that a canvass of an infinitude of infinitudes is impossible. Now our quest is at an end. I will not attempt to picture ourselves to you, except to state that we are one of the dominant mentalities in a civilized cosmos of a different curvature and energy-content than your own. Regarding the Probability Engine--it was never intended to be used in the way in which you have used it. It is in essence a calculating machine, designed to forecast the results of any given act, weighing all factors. It is set outside space-time, in order that it may consider all the factors in space-time without itself becoming one of them. When we are faced with a multiple-choice problem, we feed each choice into the engine successively, note the results, and act accordingly. We use it to save mental labor on simple decision-making routines, and also for the most profound purposes, such as the determination of possible ultimate fates of our cosmos. All this, understand, only involves forecasting--never the actualization of those forecasts. But no machine is foolproof. Just because the Probability Engine was not made to create, does not mean that it cannot create, given sufficient mental tinkering. How shall I make it clear to you? I see from your minds that most of you are familiar with a type of wheeled vehicle, propelled by the internal combustion of gases, similar to vehicles used by some of the lower orders in our own cosmos. _You_ would see in it only a means of transportation. But suppose one of your savages--someone possessing less knowledge than even yourselves--should come upon it. _He_ might see it as a weapon--a ram, a source of lethal fumes, or an explosive mine. No safety devices you might install could ever absolutely prevent it from being used in that fashion. You, discovering the Probability Engine, were in the same position as that hypothetical savage. Unfortunately, the engine was swept away from our cosmos with all its controls open--ready for tinkering. You poked and pried, used it, as I can see, in many ways, some close to the true one, some outlandishly improbable. Finally you worked off the guards that inhibit the engine's inherent creativity. You began to actualize alternate worlds.