if and 4d object casts an 3d shadow on a 3d space, what does it cast on an 2d space ?

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I was exploring the internet for 4d space and
object simulations when I found a very interesting site that presents and explains it nicely
But I couldn’t find anywhere mention of what a 4d object projects onto 2d space

Here is the site for anyone interested:
https://ciechanow.ski/tesseract/

Im sorry for bad gramar english is my third language

In: Physics