Looming over the entire enterprise is a knotty question: What makes good subway art?

As to the knotty art-historical question of where the story of the century should begin, the new installation fudges.

The person posed a lot of knotty and difficult questions for Hazrat to solve them.

But the Mayor conceded that he did not know how such a ban would work and that the concept raised knotty questions about free speech.

If that's a knotty question, so is the broader one we face as a species.

For the most part, however, psychiatrists confront the knotty questions without ready answers.

But beyond what some see as bureaucratic sluggishness is a knottier question that absorbs the mental health professionals at work here.

At least in a practical sense, these knotty questions have now been settled.

Programs like the one here in Chicago highlight many of the knotty questions that the new public art raises.

Even if the Israelis agree in principle, there remains the perennially knotty question of who will speak for the Palestinians.