Ive always assumed them to be smaller but after seeing a video of a Tec being interviewed sitting on the pipes I have come to realize the back panel alone is taller then the waterfall alone. Then I went to look on maps and the fountains exceed the span of the fountain of nations facing the World Showcase and Spaceship Earth and almost as long facing the other way. So put them all together Illuminations actually has a larger fountain display not to mention more functional then the Fountain of Nations take away the height of the super shooters but that's ok because we have fireworks to cover for that.