Icelandic product designer Hafsteinn Júlíusson created these growing rings. They were designed with the metropolitan citizens in mind. It is an "experiment in drawing nature toward man, as nature being the presupposition of life." The Icelandic moss needs regular watering and nurturing like any other plant. The rings come in four different options ranging from approximately $200 for the single ring, to $475 for the knuckle.
Pictures by permission from Mr. Júlíusson. Inspiration from Dicas Green.