Mikko Kallio´s main artistic practice is detailed work on paper. The figures in his work wander in a complex world of patterns, ink, watercolor, drawing gestures and several layers of paper. Pieces of paper meet others in a flow of leftover pieces from previous works. Qualities of material play a significant role in his art. One of his main tools is a scalpel knife. He uses it to cut, peel, shape and build different types of papers in layers. Collage, painting and drawing merge, eventually forming a subtle relief-like surface in the scale of millimetres.
Kallio works also with larger scale paintings in which he combines found objects and abandoned materials with acrylic and oil paints.
Mikko Kallio´s work is represented in public collections in Finland such as the Museum of Contemporary Art Kiasma, Helsinki, Finnish State Art Collection, Helsinki Art Museum and Tampere Art Museum.