[1][2] He is noted for his Nordic god sculptures, some of which are located at the Laxá Power Station in the north central part of the country and are arranged in the facility’s tunnels and vaults.
[4][5] Hallsteinn held more than a dozen solo exhibitions in the years 1971 to 1997, and has been hired to create monuments for various organizations and municipalities in Iceland.
[4] Early in his career, Hallsteinn created sculpture cast from concrete and various plastics.
[5] In his more recent works, Hallsteinn most often uses aluminium and iron alloy, generally in abstract and geometric forms.
[4] In 2002 a set of his sculptures based on Nordic mythology was installed in the tunnels and vaults of the Laxárvirkjun hydroelectric power station in north-central Iceland, where the works can be seen by visitors each summer.