And only the sky will beckon you with the blue flap of her wing

Or this:

"Not for the blue bird,

I'm coming to pick you up.

U - U - U - U

Following you like a blue bird"?

And also the All-Russian competition of young talents "Blue Bird", the Natalia Sats Theater with the emblem - a blue bird, and even the first Soviet passenger plane was called "Blue Bird"!

The symbol is so ingrained that it seems that it must be rooted in the deep past, perhaps have a connection with mythology, with various cultures and languages...

In fact, it turns out that no - all the little blue chicks have flown out of Maeterlinck's play! Before her, the bluebird was not a metaphor for happiness.

The play “The Blue Bird” by the Belgian playwright spread around the world very quickly and with great success a little over a hundred years ago. It is interesting that at first it was a play; the text was later revised into a fairy tale, not by Maeterlinck himself, but by his wife.