What term describes the optical trick of swelling columns at midpoint (in order for them not to appear hourglass-shaped at a distance), as used in the design of the parthenon?

Entasis

Explanation:

Entasis is defined as the convex curve given to a column in order to avoid the optical illusion of weakness. Entasis is frequently used in Classical columns, such as greek columns.

I hope you find this information useful and interesting! Good luck!

variety in color and variety in texture

correct answer is b "write as much as you can about the subject so you might earn extra-credit points"