Is it still found poetry if you find a whole verse of an existing poem?
The river sweats
Oil and tar
The barges drift
With the turning tide
To leeward, swing on the heavy spar.
The barges wash
Down Greenwich reach
Past the Isle of Dogs.
From The Waste Land by T. S. Eliot
For anyone who wishes to see this first-hand, the paving stone can be found on the South Bank of the River Thames, roughly halfway between the London Eye and Hungerford Bridge.