Mars was a vast black curve beneath black sky.

The real and imaginary parts of are plotted in the figure to the right with black and red curves.

The diagram shows the second derivative of the black curve in the diagram above it.

He dared move neither backward nor forward, but stood there trembling at the black curve of the boxed-in staircase.

Instead, he calmly sprayed a gentle black curve on the wall.

They locked, cold and grim, on the black curve of the moon bow.

The shuttle moved into darkness and he saw only a smooth black curve.

I reached out my hand to stroke the smooth black curve of a trunk.

Even as Isaac moved back slightly, a smooth black curve breached in the dark, disturbed water.

Then she took in the black military curves of the Defiant's bridge, and the color faded abruptly from her cheeks.