cross-posted from: https://lemm.ee/post/4711771
At least some of the signs were desgined by Anders Sandberg:
I found the image on Bruce Sterling’s Tumblr.
The source is from u/FuckMyHeart’s (reddit user) comment, which has a bit more info:
From the same comment and user:
AFAIK all of them are fake warning signs but, as you said, some of them reference real stuff.
I didn’t add any indication that they are fake because I assumed it was implied by posting in science fiction communities. If not, I will add a warning.