I'm fully aware of the opening day ceremony, only because I read about it.
Any guest that didn't read a backstory for that fountain would have no idea by looking at it that it was a "Fountain of Nations."
They could have called it "Fountain of Industry" or "Fountain of Knowledge" and it would be the same: just a fountain.
Did the fountain's shows cycle through the traditional music of the nations of the world with the colored lights showing the colors of the nations?
A one day ceremony doesn't *theme* a thing. The thing has to have the theme incorporated into it.
You could say that about almost anything in Future World - "Theming" wasn't expressed In the traditional way there. You could get that in World Showcase if you wanted. Were the pyramids of the Imagination Pavilion "themed" to Imagination? Yes, but not by the traditional definition. How many guests perceived just from their visage, without instruction, that the pavilion was dedicated to Imagination? And yet the theme was baked into their DNA.
Spaceship Earth looks more like a Golfball than any Spaceship I've ever seen - does that mean the "theming" of the structure is lacking?
If Future World made less sense as a result of guests not knowing that this was a Fountain of Nations then you could call it bad design. But it was designed with its purpose in mind and gave itself over to it, a keystone in the plaza of Future World but not in the theme of it; whether guests "got" it just by looking at it or not didn't detract from its success as a fountain or an element of the plaza. You merely gained more if you knew the truth of it. And its not like its name was actively concealed from guests - people knew it was The Fountain of Nations.
EPCOT Center was innovative in the worlds of design, Theme Park Design not the least of them. The truth of the matter is that the Fountain symbolized the collective of Nations beyond just its name and even beyond it's "theming" or lacktherof. EPCOT Center and its design engaged with reality in a different way than a Magic Kingdom. We know they didn't just build a fountain and decide for fun to call it The Fountain of Nations. Is JFK's Eternal Flame the same as the bonfire I lit in my backyard last week?
The answer is no - the dedication is meaningful, and the performance of that dedication is what initiates it into perpetuity. Had they called the same fountain "The Fountain of Knowledge" and didn't have any dedication of it or for it that spoke to that, then it truly
would have been less than the same fountain, because it wouldn't have been christened with intention. One where the waters of the world flowed through it together and symbolically continued to flow.
Until they tore it down.