Relates to this, not sure whether by the same creators. http://www.theguardian.com/science/alexs-adventures-in-numberland/2015/may/09/fibonacci-clock-can-you-t

Relates to this, not sure whether by the same creators. http://www.theguardian.com/science/alexs-adventures-in-numberland/2015/may/09/fibonacci-clock-can-you-tell-the-time-on-the-worlds-most-stylish-nerd-timepiece http://www.theguardian.com/science/alexs-adventures-in-numbe... >The Fibonacci clock lets you know the time more subtly, by changing colours and requiring you do some adding up.