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Summary
DescriptionBell card house.svg
English: The outside casing of each device remains stationary while the circle with parallel lines rotates with the center arrow pointing in one of three directions (♥, ♣, ♠.) If Jacks are used to represent these directions, Alice will see J♥ as her question card. She will respond with an "odd"-numbered answer card (3♥) to indicate that she is blocked by the filter. If Bob passes through a filter with the "spade" orientation, he sees J♠ as the question card, and answers with the "even" numbered 2♠. This wins one point for the team because they gave different answers to different questions.
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