A teacher is like a tour guide... 

Teaching can be like being a tour guide. A tour guide helps people explore new places, and helps them understand new experiences. Tour guides should be flexible, and should allow for exploration.

Or a sculptor.

Teaching is also like being a sculptor. Sculptors uncover what is already in the material. Teachers do this with what their students already know. 
Being a sculptor is the metaphor that best captures my ideas about teaching. I am all about empowering children, and helping them reach their true potential. I think being a sculptor, you are helping children extend the knowledge and ideas they already have. You challenge them to think and learn more.