Students mark the main ideas and important details with a pen or pencil, yellow or blue or orange.

Why did the Federal Aviation Authority require the black boxes be painted orange or yellow

The same year, the Federal Aviation Authority required that the boxes, which were never actually black, be painted orange or yellow to aid visibility.

In Act One of the show, a yellow cube is lifted from a blue box, and moved across the stage.

Act Two is similar except that the yellow cube is smaller