What should an IBL classroom look like?

They can look all sorts of ways. We have many videos online that show you some IBL classrooms in action.
Check out our IBL blog which contains a video clip of one of our "typical classes".
Our colleague John Judge says "My job as teacher is to make myself irrelevant." If you can walk out of your classroom and students continue to work effectively, you are doing something right - your students are actively inquiring.
The mathematician John Kemeny said, "...it is the greatest achievement of a teacher to enable his students to surpass him. "
And the great playright George Bernard Shaw said something similar: I am not a teacher: only a fellow-traveller of whom you asked the way. I pointed ahead -- ahead of myself as well as you."