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4D baby
We live in 4D though. The three spacial dimensions (length, width, depth) and time.
That's why the term "4D chess!" is so comical. 4D chess is just a normal game of chess lol.
When people say "4D" they typically mean four spatial dimensions, in addition to time. You're not being clever, you're misinterpreting the context.
We're not even quite sure yet that time is actually different from space. All research seems to suggest they are sides of the same coin.
Depending on how you look at it, considering time a separate dimension at all just seems silly.
Then again, this is just some more context for your context.
Yeah, I'm not arguing that time can be considered a fourth dimension, or the relationship between time and space.
But the comment about 4D being hard to comprehend was referring to the idea of a fourth spatial dimension (as we could comprehend such a thing). Obviously, we don't have a hard time comprehending time (at least superficially), so the comment about it being "comical" is pedantic and has strong "AKSHUALLY" energy.
https://youtu.be/xIarrG9ZO4I
Normal chess is 2D + time