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Use "reference point" in a sentence
"When doing artificial selection with the D’Arcy program, the player seems, as time goes by, to move further and further away from a reference point where things made sense, out into a no-man’s-land of mis-shapen inelegance, where sense seems to decrease the further we travel from the starting point."
"Having grown up in a city where the children played ball on the streets and racket sports against concrete walls, I had no reference point for the landscape of the South Shore of Long Island."