Since I do not draw or sketch 3-D figures very well I am having a difficult time describing to my class volumes of figures like: An elliptical base with square cross-sections. I tried to model it with play-doh, but with no real success. Is there a web site with some really good pictures? I think it would easier for my students to calculate the volume of something they can visualize. Thanks. Mary Harrison Salem High School Va. Beach, Va.