I didn’t think about Eno’s ambient epic Thursday Afternoon until Friday morning, as I remembered my weird walk the day before down there in the creek below the interstate highway that runs from Duluth to Laredo. That “discreet music” is an effort at song that doesn’t draw too much attention to itself, and the emotional resonance of it has a lot in common with what it feels like when you successfully get lost in the wild negative space of the metroplex.