Their code is here: https://github.com/ayeowch/bitnodes
And the install & configure guide is here: https://github.com/ayeowch/bitnodes/wiki/Provisioning-Bitcoin-Network-Crawler

Not much to it, if you have a fully patched and updated debian machine you can probably be up and running in under an hour.

-Dave

I really don't see the value in a painting like the one shown in the OP, then again I really don't know anything about art