The gist is you post an image, preferably of something futuristic looking in real life (whether photographic or cosplaying or artistically rendered, so long as it's believably realistic) with your own caption that rewrites what's happening to be something either in the future or an alternate timeline. If there are artworks presented, then you can play with it by saying "Photographed by [Artist]" rather than "Drawn/rendered by [Artist]"
Warning: you'll need suspension of disbelief and a minimum of 512MB of imagination to appreciate this thread! If you fall below that minimum recommended spec, this thread will not make sense to you.
Anyway, have fun!

Photo of New York with Moon in the background. Notice lights of the heavily automated lunar colonies.
c. 2062

Construction of a warp gate near a terraformed colony on Noachis Terra, Mars
c. 2296

Vintage hover-car

Ambulance drone as photographed by Vitaly Bulgarov
Poland, 2032

