The flickering light of the torches reflected off the shining obsidian walls, the shadows of the people slid along the floors.

We were on a grassy lawn a hundred metres long, between two immense but graceful black obsidian walls that stretched straight up without blemish into the sky.

The rumble on the other side of the thick obsidian wall was the debate already raging about the Speaker's new son and possible heir.

With a final grunt of rage, she threw the scanner against one obsidian wall, and the unit exploded into dozens of pieces that scattered across the floor.

His agonized wail echoed off the chamber's smooth obsidian walls, only to be drowned out by the horrific sound of his entire body shattering.

She stood beside the blue obsidian wall, and her reflection was distorted, a twisted figure who seemed trapped within the blurred glow of volcanic glass.

Blood splashed the eerily beautiful blue obsidian wall, and Kailea straightened, looking at her own dim reflection there.

Leto's relationship with Kailea had improved in the six months since he'd installed the fabulously expensive blue obsidian walls.

Workers continued to polish the obsidian wall.

Smooth obsidian walls rose at perfect right angles to the floor, meeting in a graceful arch above their heads.