"No author could ever write about them, and no filmmaker could ever delve into the knotty subjects of our time".
Since 2007, as Don Draper has evolved from Teflon-hardened ad executive into a more vulnerable and chastened man, the show has explored knotty, almost unanswerable questions about our ability to know our own hearts and to sustain meaningful contentment.
The knotty question raised by our seductive, if not always likeable, narrator-cum-heroine is how much of this seemingly spontaneous outpouring is true.
"A forest of spears was leveled; thirty or forty bows were drawn taut; as many barbed arrows seemed already on the wing; thick knotty clubs waved above our heads".
While the Republicans like to blast his "empty rhetoric," Obama has an almost preternatural ability to lift his audiences to a loftier plain, especially on the knotty, divisive issues of our time.
The better we know the Ashes, the longer this series' knotty history extends, the greater our appetite for more of the same.
Like other consulting firms, he said, "we are all faced with this knotty little problem of balancing our resource capacity with client work".
As we reflect on how our country, and others around the world, should deal with the knotty issue of immigration, it's worth asking, "What should guide our decision making?
Much of tonight's set comes from Rose's forthcoming second album Work It Out, which between a preponderance of highlife-y guitar lines, knotty arrangements and electronic twitches – see Our Eyes especially – similarly seems to share qualities which have taken BBC to the summit of the British charts.
"These knotty problems are very much par for the course in our work," said Foster.
