Hey, neat! Thank you! It's an "imagination engine" - the original mod @Arotrios kbin.social wrote a detailed description here.
I never really fully got my head around it but it seems to be a combination of art, poetry, music, cinema, mythology, etc and a lot of the posts in it bounce off other posts in it.
What some Lemmy communities that are dead or very low number of new posts that you would like to get more active?
My pick is /c/albumartporn