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When walking into a bar to find a place to sit, we cannot expect the empty chair with use or not. BLACKJACK CHAIR can help us to know it easily.
When people sitting, red water will rise along the back of the chair from the water cushion.
When people leaving, the red water of the back decrease slowly. Totally red water back to the cushion need about 15 minute. That mean the people may not come back.
Sitting on the BLACKJACK CHAIR is similar to drinking a wine. After tasting it, the BLACKJACK CHAIR will be the same as the empty wineglass.