And so we see earth through the eyes of aliens.
"Smell that, children? That is the smell of gasoline. It is used by planets who have not discovered gravitic manipulation or mana batteries. It is bad for the environment, but it's the most efficient, so most use it anyway."
"Madam, please stop using us as a substitute for your field trip to less developed worlds."
"See that man following us around? See how his clothing doesn't seem to shimmer nor move? That's because his clothing is made out of solid fibre."
*gasps of shock from the children*
"Yes. They have not invented solid light holograms yet. We once did the same thing, 800 years ago, making clothes out of plant, animals, and minerals. But now we have move past such..... low tech premises. "
"Madam, please cease and desist."