From ArtsCrush.org:

During October, everyone is an artist who practices the Art of letter writing! Share what you love about Olympia and place it in a symbol of love located at a place everyone loves! Dear Olympia: Love Letters to Our City is a community-wide event that invites all Olympia area residents to write a love letter to the city sharing stories about favorite places, events and memories of growing up/living in/visiting Olympia. Letters from the heart will be "posted" in a Heart sculpture created by Olympia artists Margo Westfall and Don Lovett and located in the "heart" of Olympia: the Library. Letters will be collected throughout October and selected letters will be shared publicly.

Here is the artist, Margo Westfall, describing her piece.