Searching for the elusive network RADAR

Terry has a very interesting post on his [url=http://connection.netcordia.com/blogs/terrys_blog/default.aspx]Netcordia blog[/url] about the [url=http://connection.netcordia.com/blogs/terrys_blog/archive/2008/02/15/the-history-of-ping.aspx]history of ping[/url]. Ping was based on the submarine sonar eqivalent. In his [url=http://connection.netcordia.com/blogs/terrys_blog/archive/2008/02/20/useful-visualization.aspx]next post[/url] he muses about network visualizations. It made me think about [url=http://thinkingproblemmanagement.blogspot.com/2008/02/network-visualizations.html]my own thoughts on network visualizations[/url]. I have always been fasinated by the radar consoles of air traffic controllers and recently by the consoles used by mission control during the space shuttle missions. Why after PING was there never a RADAR for networks? By RADAR, I mean the real time sweep and status display of RADAR and not the weather map type display. (Leave a comment, if you are aware of a real network RADAR emulation.)