What has not changed over the years? Does this suggest something to you?

The lines, ‘And the sea, which appears to have changed less’ depicts that the sea have stayed the same over the years. It has not changed at all.

These lines suggest a sharp contrast to the mortal human life. Human life is transitory and temporary whereas the sea symbolizes permanence, immortality and eternity. The poet makes use of the phrase ‘terribly transient feet’ to highlight the ephemeral nature of human life.