"Who do you think owns a black cube twenty miles across?"

Long rows of windows open the black cube to both inside and outside.

Then he reached into another pocket and drew out a small black cube.

It was with obvious effort that he stepped forward and offered a small, black cube.

Between them was a black cube measuring a meter on a side.

The desk was a black cube, like the one on his cruiser.

After a time a large black cube would appear, hovering on the far side of his screen.

He produced from his pocket a black cube the size of a die.

He'd been filling his mind with the contents of black cubes.

He thought very carefully, running through the information he'd received from the black cubes.