There are curves and there are straight lines. There's never going to be another way to draw a straight line except to use a ruler so whilst the built world changes around us these straight edged deliverers of the truth will never be superseded. In every office there's somebody that has a favourite ruler which they guard with their life. Woe betide the workmate who tries to snatch it run. For a simple promotional product which can cost only a couple of dollars to attract so much emotional attachment is a signpost to product class which should be considered by anyone marketing to an office environment.