The time before blue roses.

Right now, in the whole world and in the whole history of the world, there are no blue roses.
There has never have been, despite being the holy grail of rose growing, a single blue rose.
But next year, or maybe the year after, you'll be able to buy blue roses.
And from then on, there will always be blue roses somewhere in the world.
They will grow and die, and spring up again, and slowly evolve like every other rose.
And people will get used to seeing them and eventually they will be valued no more than roses of other colors.
But right now there are no blue roses.