Alex：no，you tell me what shape
教授：ok, it is four corner, now can you tell me what color?
Alex: what matter？
教授：Alex it is wood，can you tell me what color？
Alex: how many?
教授：well, there is one toy here, come on Alex, you gonna tell me what color。
Alex: no, what shape?
so the professor decided: "ok, I had it, I am going to walk away and give alex a timeout". so the professor start to walk away
