“ Movie" most clearly describes the word "medium" because it's a means or a form through which people are communicated to.
I believe a circular reasoning would be someone stating relevant reasoning of a topic for example for atheists do you believe in god the circular reasonings are all similar: god doesn't exist (because) there is no evidence to god (because) any evidence for god isn't evidence shaped like circular (circle of reasoning) Atheists have similar reasoning as they don't believe in god hope this helps :)
A common theme is cultural integrity.
