In fact, on the cover image I used some paper I made myself, the edges were very ragged and I tore only the upper edge as the paper was twice as long.

Here are the materials I used for my project: metal rulers, bone folders ... and a a kind of pinking shears that produce an irregular edge: Sometimes the paper was hard to fold as it was only a few mm too large. These scissors are of poor quality but nevertheless allowed me to obtain an edge I liked.

More images can be found in my negative space shape project II.