I have been thinking about the differences between good and ok teachers, and I came to the conclusion that two things are important: showing passion for the topic, and being able to build bridges between known and unknown, for the students to cross. I would like to explain more about this latter point in this post.
When I explain something, I need to be aware of what the other person knows, because otherwise I would build a bridge between two unknown topics, that are not connected to anything else. That bridge will therefore be unuseful and will likely deteriorate before any other bridge will be built nearby. A big chunk of information I learned from school stayed, sadly, like cathedrals in the desert, away from my everyday life, precious in theory, but disconnected and quickly forgotten.
It happens that other people find a bridge by themselves, and are enlightened and proud of that new connection. I have learned to avoid judgment on how far-fetched is that connection for me – for example when I introduce a classical composer to some friends, and they connect it to medieval movies they have seen. I could correct them, because the composer has no relation whatsoever with the time and location of those movies; but the main effect is that the bridge is lost. That long bridge is a connection, nevertheless; when a new composer will be presented to these people, they will already know one of that time: so one new bridge could be added to the network, or as an intermediate point on the existing bridge. Condemning bridges is usually a bad move, rarely something positive. Of course if a bridge is misleadingly connecting two things, I point it out; but I try to offer an alternate connection.
That’s why I take extra care in asking other people what they know already, so that I can present the new topic to them, by walking with them on bridges they find meaningful.