Are there any four-dimensional shapes in the whole wide world?

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I've looked up images of a 4-D (four-dimensional) shape and they looked like there are built by using regular 3-D (three-dimensional) shapes using a regular 3-D shape connected to another 3-D shape inside of it using a string-like thing. I'm wondering if there can be any 4-D shapes on Earth? Are there any? I'd like to hear your answers if you know what a 4-D shape is even by the help of what I just mentioned. I'm here for you!