It's rare that we need a 3D representation in the mainly 1D world that is IB physics but polarisation is one where it helps. I was trying to explain what I meant by the plane of polarisaton and the place of the reflecting surface. The look on the students face told me I hadn't done it well so thought I'd give it a go in GeoGebra. I think it worked quite well, although you have to get a good angle to see the effect.