when i saw the title, this quickly came in my mind,lol
By the way, thanks for sharing this.
The Butterfly Variations
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The Four Knights, with its tranquil continental (i.e. Spanish, Scotch and Italian) continuations - unless, a brave soul dares to venture on to the Haloween Gambit (Nxe5?!) path! Interesting association, AncientChess - shall we rename it 'The Butterfly Οpening' ? 
I was wondering, Nikolay, since the Dragon derives its name from the Draco star constellation which resembles the pawn formation of the variation, if there is a Butterfly constellation in the universe. Unfortunately, my knowledge of astronomy is next to zero... :)
The Butterfly Variations