The fourth ao feng shui in Yanzi nest.

Swallows themselves are auspicious animals, just like magpies. It's a good thing to build a nest in your house. When I lived in the countryside, there were several swallow nests on the roof. I feel particularly good when I see or hear swallows flying every day. Now living in the city, I can't see the swallows. What a pity! I'm terribly sorry.