All of Sedgley’s art, and with greater clarity starting with the “circles” and the “targets” opens to exploration of the tonal and spatial virtues of colour. Throughout the differtent phases of his career he follows a continuing, conscious process of expansion and widening of the boundaries of the artwork, investigating the possibilities of light and colour to generate space, sensation, and experience. The scientific and technological matrix of much Kinetic and Optical art is translated by Sedgley into a new spatial freedom and chromatic sensibility, more emotional than analytical in nature.