At eighteen Lars Arrhenius enrolled in his first art school, and he has been active ever since. He trained to be a painter at the Royal University College of Fine Arts in Stockholm and the Rijksakademie van Beeldende Kunsten in Amsterdam.
During a stay at the IASPIS Studio in London he commenced A-Z which has subsequently been made into an art book with the same dimensions as the original London A-Z Map. With animator Johannes Müntzing Arrhenius has created four animated shorts.
Arrhenius has had several solo exhibitions at Galleri Specta in Copenhagen and Galleri Magnus Karlsson in Stockholm. Other major exhibitions include "Five Easy Pieces" at Västeras Konstmuseum in 2003 and "The Peer Trust" solo in London in 2002.
Moreover he has participated in numerous group exhibitions, including "OM – berättande i svensk samtidskonst" at Norrköpings Konstmuseum and "De Bortbjudna" at Rooseum in Malmö in 2003 as well as "Stories" at Haus der Kunst in Munich 2002.
In 2001 and 2002 Arrhenius was nominated for the Carnegie Art Award, a prize that promotes contemporary Nordic painting. Every year the exhibition tours major European cities.
Furthermore he is represented in several museums and collections, including Moderna Museet and Nationalmuseum in Stockholm, Stedelijk Museum in Amsterdam and Malmö Konstmuseum.