I was still the right side of that invisible line.

It seemed as though an invisible, but very tangible line had been drawn in the air.

They pass an invisible line inside which almost all the buildings appear white.

"I certainly don't have any objections to an invisible line above my head," she said.

It was almost like he held an invisible line to my heart.

They were hovering hi the air above an invisible line.

Upon the throat of each man was a thin, almost invisible white line.

Some invisible line had been crossed that couldn't even be discussed.

It is an invisible line dividing one person's land from another's.