The geomantic function of two swans
Swan strictly abides by monogamy all his life. When one side dies, the other side doesn't eat or sleep, and is single-minded. Therefore, swans are regarded as a symbol of loyalty and eternal love. People often compare swans to faithful love. Swan is also a symbol of peace, kindness, loyalty, courage and great ambition. Since ancient times, people have called it a "kind angel".
Black swan is also a metaphor for some people who are rich in connotation but not good-looking in appearance. Although the black swan does not have the pure white feathers of the white swan, it is also a kind of swan. In essence, it is a very noble animal, so some people will compare the black swan to those who have connotations although they have no good appearance.
Solemnly declare: the answer is for reference only, please don't be blindly superstitious.