As Christopher pursues his investigation, the boundaries between fact and fantasy begin to evaporate.

The boundaries between the town and the Mackenzies had begun blurring.

And when you add music, the boundaries between poetry and song begin to fade.

Mitch's boundary began at the prospect of getting ex-girlfriends in trouble with the Austrian police.

The boundaries of Liberia were beginning to be officially established from this year onwards.

Who would decide where regional boundaries begin and end.

The city's southern boundary begins at the city limit of Seattle.

In novels, boundaries between life and death, fantasy and reality also began to blur.

Additionally, traditional boundaries among disciplines began to fade and many information science scholars joined with library programs.

The traditional boundaries between men's and women's tailoring had begun to fade away.