Went to see a superblock in Barcelona. Given how much they feature as urbanism of the future, they are amazingly simple. Take an intersection, block traffic in all four directions and you have a square. Plant trees, add some tables and benches. That's basically it. Replace cars with trees and don't privatize the resulting space. All you need, and all that is usually missing, is political will.
@festal So are there four dead-end streets ending at the intersection?

@benfulton No, no dead ends. It's called a superblock because it's like a bigger block consisting of smaller blocks. If you have a grid layout, image drawing a rectangle around a couple of blocks and grouping them together. The roads inside the superblock are usually closed to through traffic (exceptions for emergencies etc).

@festal