(first floor)

From 24 rue Lhomond,

Enter the ENS physics building on 24 rue Lhomond (a)
Turn right BEFORE the lobby (b-c)
Go up the stairs (c) into the green corridor (d).
Before the glass elevator (d), take the staircase to 1st floor (e) (1 flight of stairs).
On the first floor, turn to the left twice (f: first turn; g: second turn).
My office LE110 is on the right. While there, please enjoy the view and, I hope, the discussion.