The french do seem to love their massive architected concrete structures. I’m not well travelled enough to know if this is particularly a french thing, but it is striking.
Also, shout-out to the folks doing sound at paris gare du nord. Piped-in birdsong was pleasantly cheering, and the PA system in the metro station sounded like it had a couple of jazzy saxophone notes instead of the usual bing-bong announcement tones.
Didn’t hang about to check though. Turns out that getting from gare du nord to gare du lyon in 45 minutes is quite doable even with awkward luggage, but you don’t want to hang around.