Mind that I’ve never read Sheed’s explanations on the matter but I do know the traditional illustration of the Trinitarian concept (is, is not…).
I was just thinking about how to explain the Trinity to the man on the street and it occurred to me that Saint Patrick’s explanation with the shamrock might not cut it with non-Irishmen. A halved mango is close too (skin, flesh, seed) but is somewhat inadequate (not that anything really is adequate in explaining such a concept). The three states of water (ice, steam, fluid) is pretty good.
I was wondering if it would be proper to explain the Trinity by way of an atom. An atom is a single unit of matter, and yet is comprised of three components, protons, neurons and electrons. The atom IS because of those three, and yet those three are an atom because they are one.
Would this make sense? Inputs would be greatly appreciated.