An analogy is a comparison in whichdifferent items are compared point by point, usually with the idea of explaining something unknown by something known. Analogies are offered to provide insights , and can be very instructive.
Analogies tend to suggest that existing similarities imply even more similarities.
In each of these examples, there are parallels between the first to terms and the last two. In the first example, a shoe has the same relation to a foot that a tire has to a wheel. Followers, by the same logic, are similar to planents, and shells functioned in some ancient cultures as printed money functions in our culture today. Although analogies are helpful in pointing out relationships that may not at first be visible, they have their limitations. That means that it is only suggestive and does not follow in every detail.