Sphere has a sense of unbreakable, so this usually put in the bag, or put in the box, easy to not have to break, and seek line beautiful and generous, strong grip. For example, the camera camera and speakers, basically are round, round, it can be scattered around, he is not like a square, only the front of his round can be all around the line, no matter whether it is sound or pointing is more modern, and prototype ground force is better, he can easily be dispersed in the force of the sail, according to the high pressure, than the square or triangle has a stronger sense of pressure. Plus nowadays people have more appreciation and love for round things. So, later things are becoming prototypes, most others round at least is the general trend.