Timeline

I'm captivated by this Timeline clock by Anthony Dickens.  It has made me think why the circular clock has become so accepted as the conventional interface used to portray time.  A circular clock reflects the cyclical nature of the sun or daylight, conveniently divided in half for those of us who can't count to 24.  I guess this works for the repetitive nature of most people's lives but it doesn't make a lot of sense when you think about the more general idea of time.  This Timeline clock is a much more literal translation of how we perceive time.  It shows past, present, and future in a linear manner, emphasizing the constant passing of time.  Where can I buy one?