Interesting! POI wasn't the first thing to come to mind for me - and I do think other cities would work as well (doesn't the Machine even establish other teams in other places in the last season?) - but you absolutely reminded me how much I loved the grounded look and feel of the show and I do agree that's it's very interconnected with NYC! For something that is so much about technology and AI and the like, it looks remarkably non-flashy, and doesn't take the usual "shiny graphics" short-cuts to get its themes across. It's all very much embedded within the city - the cameras, the team's hiding places (an old library and a defunct sub-way station!), the repurposing of older technology, hiding within the veins of the city... There's a lot of brown and grey in its colour palette, too. Reminded me of this tumblr post from way back when - which, despite what one might think, isn't POI fanart. The name of one of the paintings, though? "New York State of Mind". :D