Consider Christus's A Goldsmith in His Shop and Sillman's Nut. These two paintings present two very different styles of oil painting. Analyze the works and the stylistic differences between them

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When oil paints were first introduced, most artists, including Petrus Christus, continued working on wood panels. Christus employed a slow and time-consuming technique of glaze building that yielded a meticulous, detailed image. Gradually, however, artists adopted canvas instead of wood, as in Sillman's work. Further, Sillman's piece conveys a more spontaneous approach of laying paint down on the canvas, including showing the underlayers of paint.