Ionic

Ionic columns were thinner than the Doric and had a base at the bottom. The capital at the top was decorated with scrolls on each side. 

Corithian

The most decorative of the three orders was the Corinthian. The capital was decorated with scrolls and the leaves of the acanthus plant. The Corinthian order became popular in the later era of Greece and also was heavily copied by the Romans. 

Doric

Doric columns were the most simple and the thickest of the Greek styles. They had no decoration at the base and a simple capital at the top. Doric columns tapered so they were 

Socrates was a Greek philosopher known for his questioning method.

Plato was a Greek philosopher known for his theory of forms. 

Aristotle was a Greek philosopher known for his work in logic and science. 

Father of Geometry