Hard to choose a favorite element, the Mc Escher macaroni, the swordless king of spades, the unified houses of spades & hearts under their androgynous queen, the well known face card ace of hearts or the angstrom of black butts…

Seeing the first person to spell subtle with a b

I think you missed my point, I don’t believe we have a self sustaining population on earth (yet)

I don’t disagree that having a self sustaining population of humans somewhere other than earth will be an important milestone.

But a much more pressing milestone is a the first self sufficient population, which I don’t see mars supporting