Wow, I stopped dead in my tracks when I rounded the corner at 2nd Avenue and 72nd Street. Construction on the 2nd Avenue Subway is going full bore, and these ducts overwhelm anything and everything else around. They are huge and imposing and just a wee bit scary. The “blasting” sign showing a stick of exploding dynamite helped with the fright factor. I am fascinated by pipes and ducts and wires and any visible indication of our underlying infrastructure. Note to self: bring real camera because the iPhone can only do so much.