Oh! I found one of my early sources: doctor who, castrovalva.
I didn’t know the geometry was based on escher as I wasn’t exposed yet.
I’d have been about 11 years old when I saw it.
The notion of “space folding in on itself” was very well illustrated in the episode and explained.
It would be much later that I’d hear about a holographic universe (not the “it’s an illusion” one but the Bohmian) but the notion of folding:unfolding was already working in my head.
Then when I learned about fractals in 1989 at 17 with FRACTINT and played around with it’s visualizations, zooming in and moving around it really added well to it.
Yet I had no problem with a “bottom”. It did not need to be mathematically infinite. Just out of reach a bit tis all.
https://youtu.be/4ocbOMyDjKw
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