Kenneth Martin made his first abstract paintings in the late 1940s and his first constructions in the early 1950s. The lines, painted in several different colours, do not overlap. While painting Martin gave the colours added attributes, with blues pushing one way and yellows the opposite, while black and green (a combination of blue and yellow) remained relatively still. The identity of each line is determined by the number of times it moves forwards or backwards across the canvas. Martin wrote that his interest in kinetics led to the changes in direction in the line. He suggested that a basis for this and all related constructions was his interest in change in movement.