you wait for one sevenfold pattern then two come along at once. Yes, that’s busses - but in this case, I saw a post on Pinterest (yes, it’s actually useful, who knew!) that was just a photocopy of a page from the journal ‘Mathematical Gazette’ - not one I knew, but tracking it down, I found the article: “Examples of Methods of Draing Geometrical Arabesque Patterns” by E. Hanbury Hankin (1925) The Mathematical Gazette Vol. 12, No. 176 (May, 1925), pp. 370-373. (https://doi.org/10.2307/3604213)
Anyway, amusingly, the page this pattern was on contained the sentence “Neither does it serve to give his method of construction”. Lol, no disrespect to (EH Hankin)[https://en.wikipedia.org/wiki/Ernest_Hanbury_Hankin] who was a bacteriologist (with some interesting work on cholera and the bacterial theory of disease) … but it took me not long to work out the underlying grid, which is again the snub-square!
The secret here is really the curved lines - it looks regular when really there are slight irregularities to it (I think). I then re-did the same design, but put flowers in some of the shapes:
Which is still nice, but honestly I preferred it before I painted it! Somehow just the inked version looked better, and more balanced? Ho hum. The pattern is stil fantastic.