Significance of Candles on Birthday Cake

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What do you think is the significance of candles on birthday cake? In fiction, candles often represent the life of each individual. As a new candle is lit, it signifies the beginning of new life and the depletion of wax implies the end of physical living. We already know that the number of candles on the cake is as much as how old we are, But have you ever wondered why we blow them? Doesn't that mean we're blowing out our life? or not? Does anyone have an idea?