Six gray pillars graced the front entrance of the four-story structure.

The shuttle flew over the island, through some vague grey pillars of smoke.

Once they had to shin a mottled grey pillar like a tree trunk a short climb, but uncomfortably exposed.

Tall pine trees circled it like giant gray pillars.

Everything was grey: the huge flagstones, the ceiling, the stone pillars that supported it.

Where it had been a terrible glowing gray white pillar of smoke loomed miles high in the night.

What they now saw was a wide oblong space flagged with smooth stones and surrounded by grey pillars but unroofed.

A road marked with tall grey pillars marched down this long plain, a flange carved on the inner face of each one.

By then Tunney was a gray pillar of the financial world with seats on several corporate boards, and was content to go unnoticed.

Above the grey pillars the roof is in darkness.