William Burroughs comes to mind first, specifically with 'Naked Lunch'. That book genuinely felt like it was tearing up the rulebook on narrative structure, stitching it back together with cut-up techniques, and then throwing the whole mess in your face. It wasn't about a linear plot; it was this chaotic, visceral assault of images and vignettes from the depths of addiction and control. It influenced so much that came after, from cyberpunk's fragmented sprawl to just the general idea that a novel could be a collage. Another massively influential experimental work is James Joyce's 'Ulysses'. I know it gets tossed around as the big, unreadable classic, but its influence is inescapable. The way it maps an entire human consciousness onto a single Dublin day, shifting styles radically from chapter to chapter—from newspaper headlines to a play script to a flowing, unpunctuated stream of thought—set a benchmark. It made the internal world as vast and complex as any epic journey.
Then there's Gertrude Stein with 'Tender Buttons'. It's less a novel and more a poetic experiment in dismantling language itself, focusing on objects and domestic spaces. Her repetitive, rhythmic prose challenged how meaning is built from words, and you can see echoes of that in later minimalist and postmodern writing. Thomas Pynchon's 'Gravity's Rainbow' also belongs here, weaving paranoia, historical detail, and pop culture into a sprawling, encyclopedic narrative that feels like solving a puzzle with missing pieces. These authors didn't just write strange books; they permanently expanded what a novel could be and how it could make you think.