Not that these drawings are street art. They aren’t populist in that way; they were meant for the great indoors. But neither do they depend on elite settings — museums or galleries — to make sense. They are abstract, not arcane. Their visual effects can be complex, but their language is plain: lines, colors, clean surfaces, the basics of grade-school art class. No wonder they feel welcoming; they take us back to the past before they take us somewhere else.