Flain focused on the frequencies emitted by his surroundings as he walked: the frequency shifted slightly, as though the width of the platform beneath his feet was changing.
In his mind's eye he saw the bridge narrowing, twisting. He sketched an idealized outline in his head: thirty-centimeter-wide strips stretching into the distance, with sharp turns. He could imagine what would happen if his foot landed outside that line.
'If the frequency is lower, the air inside the bridge is denser—that's the center. If it rises, I'm heading toward the edge,' Flain analyzed, and suddenly he sensed a second, slightly slower frequency in the room.
He stopped and leaned in to listen. He recognized two layers: a finer frequency and a metallic one.
The diffusers resonated with the metallic frequencies. Flain stepped back to avoid the interference, then continued carefully along the center path.
