This is an art work by Hideki Nakazawa.
I made this work available on the net and made it interactive by using my applet.
Just appreciate the subtle situation that every stone is living with Seki.
Don't even think about playing one more move on it! You will be extinct...
For more information, visit his web site.
Seki is a situation where both sides surround each other and can't play anymore there.
If you tried to kill the opponent by playing one more move, you will be killed instead. Thus both groups are alive.
On the above, entire group of stone is living with Seki.
Just make sure by playing at D3 by black. Then play F7 as white.
After that, chain reaction occurs and all black will be dead.