Designed by Japan's master designer Riki Watanabe in 1977, the Riki Steel 1977 has an unique clockface design based on a theme of balance between “the power concentrating inside and spreading outside."  
 
The Riki Steel 1977 is both aesthethically unique in its design composition as well as creating a visual effect of "push-pull" utilized in filmmaking.  This is probably the first of such design applied on a personal clock, making the Arabic numberals on the clockface to appear larger or smaller using with the appropriate combination of lines toward twelve different directions with numerals. You can experience it (seeing the numbers to enlarge in size) by getting close and then stepping slightly back from the clock. 
 
Made with steel, the Riki Steel 1977 has a silent sweeping movement.  The Orange version of the Riki Steel 1977 utilizes Watanabe's famouse "Lightness" font which is used in his other iconic Riki Lightness clocks.