http://www.t-hamada.com/wspikupiku69.htm только это нарыл. Но там в переводе какая то шняга понаписана, связанная с цветом "only the side of one side is visible from point of view of the bus. When the lure turns, because color pattern changes, perhaps the bus you are surprised. In addition, the color of either side the reaction is good, it can compare it is the funny point. When it is the crank and the vibration, without knowing, whether it has reacted to either color because it does, don't you think?."