This will sound absurd, but I promise this is a genuine question. I'm researching a method of home climate control in snowy climates, that involves enveloping a copper heatsink around a sheath of snow. The heatsink itself is by function, basically a spiked ball, with blade like protrusions all across it's circumference to maximize surface area, which are designed to be enveloped entirely by snow in order to be effective.
The problem is that I live in a suburb with rowdy kids. I don't want to see any of them learn a lesson the hard way (mostly because I'd get sued for teaching it) so I also plan to surround the snowball with a fence and warning placards, about the same as one should do with a swimming pool. This should deter small children, but I fear teenagers will defeat these measures and kick the snowman anyway. (My daughter insists that I "complete the look" and really, it doubt it would make a difference if it were a Snowball or a Snowman)
I am wondering, what protections/wards can I put in place so that I would not be liable should a teenager or child decide to defeat them and skewer their foot on my experiment?