I recently had another chance to see more of Lille.
Go, if you have a chance. Until the 13th of January, the Fantastic! festival is going on. Lots of site-specific modern art and happenings.
While the weather in Lille makes Paris seem downright balmy, there's a lot of really interesting stuff to see.
I went with a big group on a motivated "see a lot" tour.
A huge cling-wrap sculpture in which you can clamber into was a highlight.
A hall of mirrors...
The last stop was a pop-up beauty bar, complete with a chilly tub soak.
The TGV only take an hour from Paris Gare du Nord, an hour and a half from London. Go!