From the Super Mario Wiki
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8-Bit Pipes are objects that appear in Super Mario Odyssey. They are special versions of Warp Pipes that warp Mario to a 2D section of a kingdom styled after Super Mario Bros. Their appearance outside of these 2D areas is more blocky and "pixelated," resembing a 3-D version of the Super Mario Bros. graphic, while their appearance in the 2D section is taken straight from Super Mario Bros., albeit using modern colors instead of classic colors. They appear in every kingdom aside from the Cap Kingdom and Dark Side.