Chalk cliffs on Corsica's extreme southern coastline at Bonifacio. The unusual block of limestone, called le Grain de Sel, literally the grain of salt, detached from the cliffs eight centuries ago.
mettre son grain de sel: to intervene in a conversation without having been invited
avec un grain de sel: with a grain of salt; for a succinct discussion of the origin of this expression which dates to classical antiquity, click here, albeit Wikipedia
Photos courtesy of Pierre Lechanteux. All rights reserved.