This document discusses the concept of geometric expressionism in art and provides examples of how it can be applied. Specifically, it explores how geometry can be used to represent different aspects of Vincent van Gogh and Paul Gauguin's lives in their self-portraits. It also examines how geometric forms in 3D compositions, like the relationships between shapes in Van Gogh's self-portrait done in the asylum, can impact the viewer's emotions. Additionally, it discusses how the removal of single geometric forms from compositions can greatly impact the overall feeling conveyed, according to Gestalt psychology principles.