I enjoyed both articles on sequencing. I really liked the tiles squares as an introduction, less so as a background to the photos. I would have maybe tried ending the book with another set of diminishing tiles, perhaps different ones...
I made a Blurb "hobby book" not so long ago and the sequencing was quite challenging and fun. I didn't try any harder than finding complementing pairs, that was difficult enough. Of course when I got the book back I found one pair that made no sense at all...