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      On the shelfEither way
      Must glow
      Must stay dark

      Drag a jar into a basket, or tap the jar and then the basket. Jars you leave on the shelf could go either way.

        How to read the rules
        • If A glows, B glows. A glowing means B glows. B glowing tells you nothing about A.
        • Contrapositive: flip the rule and switch glow and dark. If B stays dark, A stays dark. It always holds. (That's what Flip it shows.)
        • A glows only if B glows: if A glows, then B glows.
        • A glows unless B glows: if B stays dark, then A glows.
        • Never both glow: if one glows, the other stays dark.
        • At least one glows: if one stays dark, the other glows.
        • Either way means the jar could glow or stay dark and every rule still holds. Leave it on the shelf.
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