Broneer, O ... American School of Classical Studies at Athens ... The calyx-krater of Exekias, first published in 1937,1 was discovered at the bottom of a well in the American School excavations on the North slope of the Acropolis in Athens. The circumstances of discovery ... 1956 ... The calyx-krater of Exekias, first published in 1937,1 was discovered at the bottom of a well in the American School excavations on the North slope of the Acropolis in Athens. ... The profile and proportions of the two vases show conclusively that the North Slope krater represents an earlier stage in the evolution of the shape. ... On the North Slope krater, where the grapes are also separated by incised lines, the rendering is quite different.