What appears, at a glance, to be a simple copper coin is, in truth, an enchanted coin. Its bearer can, at any time, redeem it to know immediately one fact that has been forgotten. The coin vanishes thereafter. It does not have to be a thing forgotten by the bearer, but it cannot be “known.” Interpretation of this stipulation is left to the gods. If the coin is unsuccessful, it will still paint an image in the mind’s eye of someone or something that does remember what was sought.