Which statements is not a valid comparison?
Using the principles of animation in a short cartoon is like sharpening a dull knife,
Studying art history is like making observations about a place you’ve never seen except in pictures.
Expecting to become a self-supporting artist in a short time is like expecting to become a famous singer after one audition for American Idol.
Being the art director of a team designing a million-dollar advertising campaign is like herding cats.