Sometimes less is more, and Black Shirt Brewing has done the most with the least, turning what could have been a gritty blacktop into a hidden oasis out back. The owners of Black Shirt have always embraced the workaday industrial feel of River North, and the patio reflects that — with a view (for now) of nearby railyards. But the space — loaded with picnic tables, sun shades and hop bines that rise from planters made of reclaimed boxcar planks — is cozy and cool, boasting a stage made entirely of old wooden pallets. Enjoy it now, though: With construction slated to take place all around Black Shirt, reality could soon intrude into this oasis.