What was notable about Robert Adam’s design for the University of Edinburgh?

Robert Adam’s 1789 design for the University of Edinburgh is notable primarily for its entrance front, which is considered perhaps his most successful exterior design.1

The building, often referred to as the Old College, was constructed on the site of the university's original location at the Kirk o’Field. It stands as a significant architectural work that replaced the earlier structures of what was originally known as the "Toun’s College," which had been established following a royal charter in 1582.23