[toppy]

You can find an explanation here

https://blog.codinghorror.com/software-projects-as-rock-clim...

http://adaptivepatchwork.com/2011/01/10/why-programmers-love...

http://breckyunits.com/what-can-a-programmer-learn-from-rock...

[a-l-c-o]

Thank You toppy.

Your second link mentioning problem solving is interesting. But overall I think the comparison is a little stretched.