The tendency toward overspecialization in the study of artifacts is unfortunate  Scholars can enhance their understanding of a certain artistic period by studying art from earlier periods that had a significant influence on it
For instance, because of its influence on Spanish artisans, a proper understanding of Arabic porcelain is indispensable for a proper understanding of Spanish porcelain
To understand fully the historical events of this century, a historian must have an understanding of similar events in earlier centuries.