So... You know enough about Epcot to know about the wand... And about UoE's new color scheme... And the fact that the entrance plaza used to look different (let alone the fact it's called the entrance plaza)...
But you don't know what the "granite emplacements" are?
I'm with Sak. You should use some better bait.
I honestly didn't know -- the last time I was at WDW as a kid was in 1989 (between the opening of MGM but before Star Tours opened) and then I went again with my wife in 2007 and we were both surprised by the change to the entrance plaza.
We're going back this year and I've been digging into all things WDW, esp the history of closed and changed attractions but nothing about Leave a Legacy had come on places like Widen Your World and Yesterland.