The plexiglass wall can bounce back an audience's reflection like a mirror.

The researchers tested bumblebees using an experimental "flight arena" - a box with a translucent plexiglass wall on one end that had 46 evenly spaced holes drilled in it.

Through the plexiglass wall, Mr. LaValle said the inmates adapt.

Visitors can view the meerkats through a plexiglass wall, a bubble window in one of the outer walls, or from a boardwalk which provides a bird's-eye view of the colony.

In "Secret Sunshine Schedule," a piece that is impressively startling in its imagery and execution, the performers are enclosed but not necessarily trapped within four plexiglass walls.

"They'd climb over nine-foot plexiglass walls at night, and in the morning we'd find them on the floor, fighting."

After going through the door, the player tags their partner, who is show another 25-point question, this time represented by one of two ropes hanging off a plexiglass wall.

The day's payoffs are posted beside the cashier, who sits behind a plexiglass wall.

William Tell: Based on the classic fable, this stunt involved one player using bows to launch toilet plungers towards a plexiglass wall, with a circle on it representing a target.

Streakers trying to streak on a municipal tennis court, but getting abruptly and painfully prevented from doing so by a plexiglass wall, are almost unbearably funny.