This time I had a purpose - I planned to use the book as an exemplar when teaching my heartbeat script. I knew I wanted to use a concertina form and then set off, gradually adding letters to the book as they were finished.
Once I had attached all the letters, I then pondered for a while how I would complete the book. In the end I chose to maintain the concertina; but to contain the exuberance of the book by creating covers and 'tapes' that could be threaded thru some stitching to hold it together for most of the time. I also thought it needed a slip case, so covered one in nice rusted paper.
The book can be held in the hand and the pages turned; or it can be fanned out as a concertina. I like the flexibility.