Interestingly, according to Wikipedia (the source of all true facts, I'm sure!), this year's Tour was originally scheduled to start in London, but that TfL pulled out a week before the announcement of the location. Too bad...it would have been fun to do a London colourway, but hopefully there's another chance!
Moving on to Stage 4, we have the gradient colourway, this year drawn from legends around La Planche des Belles Filles, which translates to "board of the beautiful girls" and is the mountaintop finish of Stage 5. There are two stories around the origin of this name. One is that it comes from the local environment and the preponderance of beech trees; in the 16th century, the area was described as having many "belles fahys" (beech trees), which was then corrupted into Belles Filles. Planche (board) is derived from the name of a nearby small town, Plancher-les-Mines.
The other, more disturbing story, comes from the time of the Thirty Years' War (1616-1648), and holds that young women from the town fled into the mountains to escape approaching Swedish mercenaries. Rather than surrender, the girls chose to drown themselves in the lake. One of the soldiers engraved an epitaph for "les belles filles" on a board as a memorial. Needless to say, I used the beech tree image as the inspiration for this year's gradient, Fagus.