The 4″ x 4″ images were chosen as backgrounds for the 4×4 Arch Tunnel Book (with care to ensure the image seen through the smallest archway will be interesting).
The square images could be the cover of a 4×4 book, too. Plus extra images are included to use on any of the pages of the book (maybe sticking out a bit from the arch windows to see them when the book is closed).
Useful for other projects and ATCs, too.
This book is also included in the Tunnel Book Kit; see all the other kit components available to buy separately.
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