Replying to my earlier post because the we-can't-see-the-decayed-structures-that-were-made-from-trees is speculation extrapolated from history. Greeks started out with temples made of trees. The vertical lines/grooves of the stylized marble columns we are left with were made to mimic tree trunks. The Egyptians started out with leather and chests for crypt or burial funerary goods made from real animal hides and real wood. As materials became more scarce, faux leather was used and wood grain-like grooves made from woven reeds for the chests that we're left with.