I found a funny model of the qubit written by Aerts in Foundations of quantum physics: a general realistic and operational realistic and operational approach. At the beginning the qubit is at the point P on the Bloch sphere. It will be measured along another direction (two opposite points on the sphere). There is an elastic between these points. A and B. P falls orthogonally on AB at Q and then the elastic breaks somewhere between A and B. So Q is projected to up (A) or down (B) according to the probability formula of QM!