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In many cultures, butterflies are the soul. In Japanese culture, for example, believed that relatives of the dead may visit the living as butterflies. So, we see a butterfly and one is usually a good omen. However, if you see a swarm of butterflies, a bad omen.
In Chinese culture, two butterflies together, a symbol of love. See also the Chinese symbol of the evolution of butterfly and Renaissance. This is the common explanation of the symbols of a butterfly in many cultures of the world.