Countdown Topiaries in front of Cinderella's Castle?

I have no idea where to post this, so if this is wrong, please feel free to move it. But we were going through some of my wife's old family photos the other day, and there is a picture of her standing in front of a "200" topiary in front of Cinderella's castle. She swears it was in the spring of 1988. Then there's another picture of her standing in front of a "15" shaped topiary, which she says is from the same trip. Anybody remember these?

My best guess was that they were a countdown to WDW's 25th anniversary in 1986, or the opening of D-MGM in 1989. Any other ideas?