The clocks in Switzerland's railway stations with their particular modern look have become an icon of Swiss design.
The clock is the brainchild of Hans Hilfiker, an engineer with the Federal Railways, and was used for the first time in 1944. The timepiece remains eye-catching 75 years on.
Hilfiker was inspired by the Bauhaus movement, a German art school noted for a synthesising technology, craftsmanship and design aesthetics.
Instead of numbers, the clock face shows simple vertical lines as indicators and a rotating red second hand reminiscent of the traditional signalling disc of the station masters.
Despite its age the design looks as young and fresh as ever. It served as a model for the clocks on the tablet computers which Apple introduced in 2012.
In a bid to avert a legal dispute, Apple agreed to pay CHF20 million ($20.1 million) to the Swiss national railway company in exchange for the rights to use the clock design. It disappeared from iPads soon afterwards, when Apple released its iOS 7 mobile operating system in 2013.