Metaphors and Learning

As I just finished the book "i never metaphor i didn't like" (see review below), I decided to write a few metaphors to stretch my muscles.

• "Learning is to teaching as eating is to cooking. You can't fully appreciate the former without having done the latter."
• "The Arizona desert is a kaleidoscope of rock, sky, and cloud".
• "A blog is like a journal, people regularly appear there, and it should change each day.
  A website is like a tombstone. People visit once a year, and the contents are unlikely to change."

Write a few and post them!