A series of studies on tangible pictures and their application to blind persons are reviewed and possible explanations for the suggestion of depth offered by outline drawings are discussed. Findings from ancient cave and rock art, together with drawings made by blind children and adults suggest that outline drawings contain some elements that are universal, independent of culture and of the faculty of vision. Illustrations of some of the blind individuals' drawings demonstrate marked similarities to the development of drawing in sighted children. Studies featuring recognition of tactile pictures and devices used to depict movement and abstract concepts are reviewed. Conclusions center on the blind individual's innate pictorial abilities and the usefulness of encouraging blind persons to experience others' pictures and make their own as well. (CL)