Spider-Man: Into the Spider-Verse's animation style was the most unique I've seen since Satoshi Kon's PAPRIKA. It's truly meant to be seen in 3-D. The animation style is so unique that I found this New York Times article outlining the process behind the film and how the team decided they wanted to bring Spider-Man to the screen in a completely new and fresh way: "Many of those conventions are built into the systems that produce computer-generated imagery. “In C.G.I. films, many things you see
onscreen are the result of the desire to automate the process: simulations for hair, cloth, wind, rain, etc.,” Persichetti explained. The decision to forgo tradition “was incredibly daunting — but also
incredibly freeing...“From the beginning,” Miller said, “we wanted someone to be able to
freeze any frame of the movie and have it look so good, they’d want to
frame it and hang it on the wall.”
And it works! From including 5 Spider-beings in one scene, to flipping many of the fixtures on their head, the film brings a fresh perspective to a beloved character.