Giselle and La Sylphide are two very similar ballets with very slight differences. They both have the forbidden love story, but Giselle has a girl who falls out of love with her boy and into love with a stranger, while La Sylphide has a boy who falls out of love with his girl and in love with a mythical creature. Also, Giselle is a more classic ballet in the dancing in the first act compared to La Sylphide which has more folk dancing in the first act. Both stories are two acts with a fantasy story in the second act. These two stories ended in sadness and reminded me of Romeo and Juliet in the sense that there was forbidden love that lead to a tragedy… I guess great the Ballet writers think alike.