This is a very clever way to implementing new types of network security. This approach combines port-knocking and honeypot virtualization to obscure the real communications port.
Here is the brief from /.
"The shimmer project implements a cryptographically-based system for hiding important (e.g. SSH) open ports in plain sight. By automatically forwarding from a range of ports all but one of which are honeypots and by changing the ports every minute only a user knowing a shared secret can determine the location of the real SSH server."