A spare shoe

We walked past the vast plaza in Lisbon where the royal palace stood before the earthquake of 1755. In front of it is the Tagus river. A ramp leads up from it to the square. Once upon a time, visiting dignitaries would descend from their boat and walk up these steps to the palace. Much has passed in Portugal and the world since then. A spare shoe left to the river is a mundane reminder of constant change.