Concrete is important to Glenn Booth in several ways. The Detroit-born artist combined concrete with rubber, canvas, wood, and other materials to produce his early three-dimensional works of art. Now working in New York, Booth has recently shown a group of paintings best described as both in and on concrete. He makes the initial image by working pigments into wet concrete. Then when the surface is dry and hard he continues to develop the images with oil paint. Booth is able to create reinforced sections as thin as 1/4 inch. Even then an unframed work of average size may weigh 50 pounds or more.