The lustrous walls flowed by, dizzily.
We had swept over toward the right wall of the cleft and were gliding over a broad ledge.

This ledge was, I judged, all of a hundred feet in width.

From it the floor of the place was dropping rapidly.
The opposite precipices were slowly drawing closer.

After us flowed the flanking host.
Steadily our ledge arose and the floor of the canyon dropped.

Now we were twenty feet above it, now thirty.