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“Back then there was a distinct, visible horizon of disbelief that the world could actually change,” said Mr. Forrest, who is also one of the richest people in the world.

“So it’s a very visible horizon of a day.”

She said they climbed and turned right “into a dark area with no visible horizon.”

If you stand outside on a non-mountainous part of the planet, the visible horizon is only about 5 kilometers around the Earth’s curved surface from your location.

There is no such grove, I know now, but the morning of my return to Devon I imagined that it might be just over the visible horizon, or the horizon after that.