By GERALDINE FABRIKANT

CHICAGO — One of the stars of the Oriental Institute’s new show, “Visible Language: Inventions of Writing in the Ancient Middle East and Beyond,” is a clay tablet that dates from around 3200 B.C. On it, written in cuneiform, the script language of ancient Sumer in Mesopotamia, is a list of professions, described in small, repetitive impressed characters that look more like wedge-shape footprints than what we recognize as writing.