I've always wanted to do something like that! It's brilliant. You should add "here is your grand-grand mother, what's her name?" and "here will be your potential grand grand son, do you think they'll remember your name?"
Out of interest, what country are you from? I'm curious at the fact you called it 'grand-grand'. Here in Australia we use 'great grand(mother etc.)'. Must be a cultural thing.
I just guessed, I'm french :)
Ah makes sense! Well I knew what you meant, I was just wondering whether other countries had this 'great-grand' thing or just Australia.
Same here. These sort of time scales should really make us humble and question the meaning of "making a dent in the universe" or taking our legacies too seriously.
"Dent" is not something large, and doesn't have to be a conscious memory. A tree you plant won't remember you.