Retro-futurist iconography can use the science fiction styles of the 30’s, 40’s, 50’s, 60’s, inspired for example by the Astounding Stories magazine covers (or Amazing Stories), or original books covers. See also: Cover Gallery
In the middle of the 2010’s, the NASA has published many retro-posters:
- NASA's Latest Retro Posters Celebrate The Voyagers' Astonishing Interstellar Mission : ScienceAlert
- These NASA Travel Posters Advertise Life on Exoplanets... And They're Incredible : ScienceAlert
- NASA Just Released More Awesome Space Tourism Posters : ScienceAlert
In comic strips, the retro-futurist stories often happen in the 19st century (Industrial Revolution in Europe).
But it could be also in Ancient Greece: I can easily imagine linking Fortran and the Antikythera mechanism in a strange picture, even with Archimedes of Syracuse (maybe its inventor)! Any other great ancient civilization will of course also give interesting results.