jayesjay

I have just gone to the turtle site,  https://turtlegraphics.fun/turtle.html that you recommended, William, and opened an example.
I then saved it and entered it into a PPX9 page via ^G, as a png
This worked fine, and although I don't use Affinity, I expect it would work there.
So that may answer your need to do Turtle artwork and put it into an Affinity document, surely.

I agree with Alfred's comments re the requested facility as inappropriate of the product to the Affinity range, and of a limited sales base expectation.
I would however thank William for posting the video, which I find fascinating, but I think it would be more appropriately  placed in the lounge  or science sections of the other related forums as an interesting find.

I agree with Alfred's comments re the requested facility as inappropriate of the product to the Affinity range, and of a limited sales base expectation.
I would however thank William for posting the video, which I find fascinating, but I think it would be more appropriately  placed in the lounge  or science sections of the other related forums as an interesting find.

I agree with Alfred's comments re the requested facility as inappropriate of the product to the Affinity range, and of a limited sales base expectation.
I would however thank William for posting the video, which I find fascinating, but I think it would be more appropriately  placed in the lounge  or science sections of the other related forums as an interesting find.

William, these are the results of a couple of Google searches- "book page design," " where  do I start the text x on a page, etc"  I did not find anything about text blocks staring on a diagonal. However, see the note below - doing that is more pleasing aesthetically.

 
https://99designs.co.uk/blog/tips/book-layout-design-typesetting-tips/
 
https://www.tckpublishing.com/6-keys-for-book-page-layout/
 
https://libguides.lib.msu.edu/c.php?g=97090&p=908734
 
https://en.wikibooks.org/wiki/Basic_Book_Design/Headers,_Footers,_and_Page_Numbers
 
https://en.wikibooks.org/wiki/Basic_Book_Design/Margins
 
Using the recommendation in the  last guide above, I tried a sample 6x9 inch page (no text, just lines) with the defined equal all round margins. Then it is clear that the top left point of the text block would lie above the diagonal.  However, bringing the text start point to lie on the diagonal increases the top margin, but is more aesthetically pleasant. The bottom right corner also would rise, with a similar result.
 
I haven't read the whole thread; I just looked up the topic as far as I got. If someone else has explained further, great!