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$\begingroup$ I think a common object that would work for this is a glowstick: pass it around under the table, squeezing it for a 'no' vote. Then the last person shakes it to reveal the result (dark for 'yes,' glowing for 'no'). $\endgroup$
– 2012rcampion
Commented Dec 28, 2022 at 21:05
1

$\begingroup$ I agree, pretty much anything that has a state that is only observable through deliberate manipulation, can only change state once and maintains the new state would work. The hardest part is probably keeping it unobservable until you deliberately look. A box, a paperclip and a piece of tissue paper pasted over a hole inside the box. Anyone who poked the paperclip through the hole would break the tissue paper, etc. $\endgroup$
– Bill K
Commented Dec 29, 2022 at 19:28

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