Later, at a nearby farm, Ms. Nassauer set a round tiller blade atop an electric-fence post, so that it resembled a sunflower.

WSJ: Ki Nassauer, Envisioning Treasures From Piles of Junk | Creating

Plans are also afoot, according to Patton, to install an expensive high-tech electric perimeter fence with an intruder alarm.

BBC: The rhino wars of central Kenya