Photographer unknown2018-09-252018-09-25early 1970http://172.16.52.76:80/cdm/ref/collection/coll4/id/72https://hdl.handle.net/20.500.12111/5214Clifford Risk3x5B&WPermission to use this image must be requested from the Institute's Archives. Please contact archives@ias.edu.Institute for Advanced Study (Princeton, N.J.). School of Natural SciencesImage