Seems like you could apply the clever transforms to generate a displacement map (that then allows you to move it across any source image and quickly get the Droste effect).
(I still have not made it all the way to the end of the video though, perhaps that is where they end up.)
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This video is an absolute tour de force of communicating a complex concept.
All of 3Blue1Brown is - hoghly highly recommend
I've seen most! Highlighting this one out of them all. Exemplary! : D
Seems like you could apply the clever transforms to generate a displacement map (that then allows you to move it across any source image and quickly get the Droste effect).
(I still have not made it all the way to the end of the video though, perhaps that is where they end up.)
"Complex concept"
I see what you did there.