A walk in a familiar place turns strange. The speaker goes out in the afternoon and finds the spot "other than it used to be." The title, "Confused," fits that first jolt: the ground they thought they knew no longer matches what they see.
The middle stanza offers a kind of consolation, or at least a way of thinking. What feels like loss, a place gone missing, may simply be a different place standing where the old one was. Nothing has vanished; it has changed its identity.
The last lines make this concrete and a little surreal. The speaker comes to walk in the garden and sees a sea. The poem doesn't say whether this is a trick of light, a flood, or the mind seeing something new in an old scene, so it stays open. The mood is quiet, puzzled, and gently wondering rather than frightened. The speaker seems unsettled but also curious, willing to let the world surprise them.