Housetrees is an art installation in two public places in St. Pal, the Highland Park Library and the Sun Ray Library. It was sponsored by a private nonprofit called Public Art Saint Paul (PASP), who works in partnership with the City of Saint Paul to provide artists with the opportunity to brighten up the city with inspired creations. In this case, Houetrees is made up of steel 'trees' with differently-shaped wooden habitats (their word) on top. It's meant to give the viewer the space to reflect and introspect.