You are the town and we are the clock.
We are the guardians of the gate in the rock.
The Two.
On your left and on your right
In the day and in the night,
We are watching you.
Line three of each stanza is (with small variations) a  spondee : a metrical foot of two stressed syllables. These stresses fall hard and ominously, like a double blow or double stroke of doom, as befits the poem’s subject and speaker: “Two” mysterious agents of fate.
The Two