On the surface, a charming (??) picture of a young lady on a swing. Harmless, and so commonplace that you probably wouldn't even notice. But look at it a little closer and you'll see the devil's in the details, it's a masterpiece of French innuendo and erotic symbolism. Viewers at that time would have recognized the young lady wasn't wearing knickers (they didn't exist yet), and would have understood the young man's enthusiasm for her billowing skirts. The shoe flying off the foot (classically a symbol of virginity, the foot is sexual, think Cinderella, or foot fetishists), the two angels (?? Putti) looking on in the background, one in fascination, the other turned away in (?? Shame), the dog barking, a symbol of constancy or fidelity, the old man (Guardian or Husband?) in the background pulling the swing, the Cherub looking on with a finger to his lips to admonish secrecy...there's a whole lot more than first meets the eye.
The first link a slight breakdown of the symbols and interpretations, history and context of the painting, the second - covers the first - but as well refers to the symbolism of the painting itself - as it appears in later works of art...
Links:
- https://www.artsy.net/article/artsy-editorial-undressing-erotic-symbolism-the-swing-fragonards-decadent-masterpiece
- https://www.reddit.com/r/MovieDetails/comments/env0o1/in_the_great_gatsby_2013_while_tom_is_cheating_on/