The use of rotating discs is no novelty per se, as in the 1970s various watches were introduced that used discs as opposed to hands to indicate time. Although few of these were popular, Seiko's limited edition "Discus Burger" from its 2007 "Moving Design" series — more or less a copy of the SWA0017 model brought out by Swatch in 1994 but with an extra seconds disc — continues to be very popular with collectors. The Discus Burger, which came out in black and white, uses discs with digital-type hour and minute markings that rotate on top of each other much like hands would. A small window at nine o'clock in the otherwise plain unmarked dial shows the time. Mintiens' idea of having the entire dial rotate clock-wise in which co-planar sub-dials with indexes orbit around a virtual axle was new.