Very beautiful in it´s simplicity. One of the most interesting casual games I´ve seen so far.
Here is another one that is quite remarkable (not flash though), you probably have heard about it:
http://intihuatani.usc.edu/cloud/Oh, got to mention that the download is 38 MB, so maybe this might not sit well with your boss (strange attitude in times of flatrates, but not unheard of).