Clack started out as a painter, sculptor and an etcher, trained at Camberwell and the RCA. At a certain point, he made a move from painting and etching, to digital. During this move, one thing always seemed to remain a concern in his work, the aspect of the surface. The surface had always been an important aspect in his oil paintings and counterintuitively became even more important in his move into digital. Another important aspect to his work is his interest in the dynamic and interrelationship between religion and atheism, but also one cannot help but feel a connection here in terms of a struggle between the material and immaterial aspects of the actual work and his interest in religion.