Concertina book made of double cards with square holes

Making books is one of my passions. I have so many roll of sheets from when I am gel printing, so why not try to use a part of them, making this concertina book. A simple construction where you can make as many spreads as you want. I have used a pack of double cards with a square hole. The hole is 8,5 cm X 8,5 cm. But you can use any kind of double cards with holes, circles or rectangles. https://www.dragenkunst.dk/   / dragenkunst     / dragenkunst   https://pin.it/6obzHAP