Halldór Ásgeirsson has from the beginning worked mainly with the four elements earth, water, air and fire which he express through different media such as paintings, films, poetry, performances, installations, environmental works etc.

The theme of his works is often based on the natural characteristics of his country like the volcanic activities but in 1992 Halldór began to weld lava stones. When the lava is heated it become red and fluid in few seconds and melts before finally transform into a black glass.

From the lava glass he began to experiment with clear glass, water and light. He featured bottles or vases full of colored water, through which halogen lights projected shadows shape were reminscent of molten lava. He began working with muscians like the CAPUT Ensemble, one of Europe´s leading new music ensemble. At EXPO in Aichi, Japan on 15th of july 2005 during the musical performance he „draw“ ever changing water color „paintings“ by using overhead projector, a glass box filled with water, ink colors and a dropper. The aim was an intense dialogue between the visual and audible.