A Gigantic Jigsaw puzzle

1 - Thank you Samj! I had not seen that website and it appears it is relatively new in the last couple of years. Thanks for the links!

2 - Just as a side note on posting, if you could be sure that when you paste into a post that the font is not carried over, that would improve readability. The name Diogenes Of Oineanda above appears in a hard-coded font and isn't readable on dark background. The best technique when pasting into a post is to select the text and then use the "A", "T" and brush icons, each of which have a "remove" function at the bottom of the dropdown. That allows you to remove hard-coded font, size, and color coding. If you get a chance to try it out I'll leave it as is for a while and then (if I remember) I will come back and fix it myself if you don't fix it first -- thanks!

Yes that looks great - thank you!