The Hellenistic reliefs may be divided into three classes: the pastoral reliefs such as the scenes showing sheep and a lioness and cubs, called the Grimani reliefs, in Vienna; mythological reliefs like the Bellerophon and Pegasus of the Palazzo Spada,[50] or Perseus and Andromeda of the Capitol[51] in Rome; and more complicated little scenes or groups like the Menander relief of the Lateran,[52] the Apotheosis of Homer,[53] the slaying of the Niobids,[54] or the visit of Dionysos to a dramatic poet.[55] They are all closely related to painting--how closely a reference to Pompeian wall-paintings or mosaics like the famous Praenestine pavement will show--but there are some differences between the groups which are worthy of mention. The pastoral scenes are straightforward and naturalistic. The little group of a countryman driving a cow past a ruined temple in Munich is a good example of straightforward naturalism. The mythological reliefs are usually distinctly affected in style. The gesture with which Perseus receives Andromeda is like that of an exquisite handing a lady from her carriage. Bellerophon waters his horse with a nonchalant air.[56] Daedalos and Icaros[57] present a curious mixture of affectation and realism. But it may now be regarded as certain that the Spada reliefs are Augustan in date at the earliest, and the affectation may well be imported. This is, indeed, partially demonstrated by a comparison of the two copies of the Daedalos-Icaros group in the Villa Albani, of which one is Roman, the other probably late Hellenistic. At the same time it is remarkable that the figures of the mythological reliefs all show the long slender proportions of Lysippos. This at once suggests a Rhodian connexion. Mythological groups are favourites in Rhodes, and it is the one place where the Lysippic tradition certainly lasted. It is not a wholly hazardous suggestion to propose a Rhodian origin for the mythological, and an Alexandrian origin for the pastoral, reliefs. One might be tempted, therefore, to ascribe the most intimate and domestic scenes to Pergamon, but there is insufficient evidence for proof at present, though the reliefs deserve careful study with these possible divisions in mind. In general we can only point out their fine naturalism and perfect execution. Their artists seem to have mastered all the problems of perspective and to deal with the third dimension as easily as with the other two. It is natural to notice some advance in freedom of style. The earlier reliefs, like the Telephos frieze, or the Dolon relief,[58] are in less pronounced relief and with less carefully conceived perspective. Later reliefs like the so-called Menander relief show some of the figures in part detached from the background, while the perspective of a group is most subtly graded. We may compare the finest of them with the bronze doors of the Florentine Baptistery and their marvellous panels.