Survivals of this sort are known as ‘skiamorphs’ (shadow shapes), and in one form or another they are very common in technology,^([sic]) A modern instance is the survival of timber graining on the surface of plastic mouldings and furniture.
Source: wiktionary
As mentioned above, archaeology shows us that the echo of one material is often imitated in other materials as a ‘skiamorph’ (skia, Greek for shadow; morph, shape). Here one medium ‘shadows’ another material, which may have become outmoded by quicker industrial processes yet the exact shape of the older form is retained in the newer material.
Source: wiktionary