I thought the fact that the Colosseum had 3 levels with 3 different kinds of columns, 1 variety on each level, was really interesting. So I found this:
Most buildings (and most clients) are satisfied with just two orders. When orders are superposed one above another, as they are at the Flavian Amphitheater - the Colosseum - the natural progression is from sturdiest and plainest (Doric) at the bottom, to slenderest and richest (Corinthian) at the top. The Colosseum's topmost tier has an unusual order that came to be known as the Composite order during the 16th century.
I think that maybe this goes back to the superiority complex that I talked about in class. The royal residence in Pergamon sat at the highest point of the city so that they could experience a feeling of domination.Corinthian columns (the ones at the tops) are the most ornate, and the most artistic, so therefore they would deserve their position at the top. Whereas, in Athena's precinct, only doric columns were used, this was to preserve the graceful simplicity of the structure, which was much smaller than the Parthenon and the surrounding temples. In conclusion, art can give insight to the thoughts of society in ancient Greece.