I agree with Yoda. (The title of this piece is a quote of his.)
This morning, as she was finishing her cereal, my daughter was completely taken by the reflection of her cup on our table. She was passing her hand under the table and above the table and, as is her custom, talking the whole time.
Then she fired out a wonderful question.
“Daddy, why is the reflection upside down?”
In my head, I thought that my students should definitely be able to hammer out a pretty reasonable response to that question by the end of the first unit of geometry.
And thanks to my daughter, they will.