Zendo fan, Columbus Blue Jackets fan, Dominion Fan. These are 'permanent microbadges' to free up space on my microbadge row
And here I thought it was "...it contains at least one ungrounded piece that is not red." OK, I admit that I thought of the "ungrounded yellow" rule first, but one of the things that makes Zendo interesting is that you're never sure you have the rule until the master confirms it.
I also spotted this rule, but exactly one or at least one? As Jeff points out there are other possible rules aswell. In fact in any Zendo situation there are infinately many possible rules, but only a few of them aren't ridiculous.
