Invisible Lines

He picked his way across the living room carefully, avoiding the overstuffed chair, and the knick-knack display, both of which, he knew from experience, were encircled by invisible lines that, if crossed, would alert her to his presence as surely as a fly in a spider web signals the struggles of new prey to be wrapped up in silk to be devoured at her leisure. These were off-limits area, places where he was not welcome, not allowed, sacrosanct to her alone. As long as he stayed on his side of the lines, he was safe, but as they were invisible, this could be difficult, especially when, like this morning, the lines shifted.