A couple nights ago, like many nights during the pandemic, I went on a bike ride around Brooklyn — down the same streets I always do. Just a few weeks ago, they were deserted, but now they’re lively and filled with new additions to the built environment: so-called “streateries” comprised of planters, vibrantly painted sheets of plywood, jersey barriers, picket fencing, cinder blocks, trellises, and all sorts of materials that someone could scrounge up at a hardware store in a