You must have noticed that whenever you measure something with a simple ruler the only reference you take is “0″ why?… Because the ruler starts with it simple isn’t it but now now designers Hououng Lee, Seunghwa Jeong etc. has designed a special kind of ruler having “0″ at the center which makes it quite easy to measure or to draw lines. There is some thing weird with this ruler and that is a solar panel attached to it at one end and apparently  it seems to be no use of it but those Japanese are not fools really, they have put it to the customers to think and find a better use of it?