Tvísöngur is a quirky sound sculpture in Seyðisfjörður, East Iceland, that looks like a cluster of interconnected mushrooms or igloos. Created by German artist Lukas Kühne, it consists of five domes of different sizes, each with its own unique resonance corresponding to a tone in Icelandic musical tradition. Visitors can have fun exploring the acoustics inside the domes by singing and making sounds. The sculpture offers a peaceful and mystical experience, with stunning views of the town and fjord from its mountainside location. It's definitely worth a visit for a unique and interactive art experience in the Icelandic countryside.