FT-Clock app for iPhone and iPad
That is a funny tool and that is a true Clock.
And the clock is constructed by Fibonacci
You not only use it as a clock,
but also playing.
Practise yourself,
Enhance your brain,
Improve your IQ.
What ever, it is a watch, it is a mathematic tools, I wish you like it.
Use and Playing,
I am sure you will be irresistible.