Fibonacci numbers

What are fibonacci numbers realistically used for in programming? I was in a lecture where my it was mentioned but I didn't get their purpose. Apparently it has something to do with graphics but I dont quite get it.
How about this:
http://en.wikipedia.org/wiki/Fibonacci_number#Applications

Among other things:
* Fibonacci numbers arise in the analysis of the Fibonacci heap data structure.
* Fibonacci numbers are used by some pseudorandom number generators.
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