On top of everything else was a shiny black square.
I saw a small black square cut into one wall about a foot above floor level.
Hands shot from the black square of the open trap.
The wrong size for that big room with its black and white squares.
A movement must not take you through a black square.
Richard stood up and walked over to the black square on the wall.
He held a small black square of the food in his hand.
Why, anyone with half a brain could see that big picture was nothing but a black square.
The black square at the end flashed on and off.
A sudden change had come to the black square that was set in the wall.