foreshortening convergence and drawings from a blind adult esref is a congenitally totally blind man practiced in drawing he was asked to draw solid and wire cubes situated in several places around his vantage point he used foreshortening of receding sides and convergence of obliques in approximate onepoint perspective we note that haptics provides information about the direction of objectsthe basis of perspective hypothesis of occupational etiology of hodgkins and nonhodgkins lymphoma a casecontrol study after a review of the research performed about the occupational hypothesis of malignant lymphomas etiology a personal interview schedule was used to study the occupational exposure among 89 patients with hodgkins disease and nonhodgkins lymphoma and 89 referents the agricultural workers only presented a significant relative risk for the malignant lymphoma as a whole and for nonhodgkins lymphoma but not for hodgkins disease the results are confirmed by a matched pairs epidemiologic study the possible etiologic factors connected with agricultural works are discussed