This keeps your fold line straight. Image caption, Draw half a circle that starts and ends on the folded side of the paper The fold is your shape's line of symmetry so you only need to draw half ...

Trihexaflexagon is constructed by cutting a strip of paper so that it may be marked off in 10 equilateral triangles (A). The strip is folded backward along the line ab and turned over (B).

Two French artists are creating beautiful drawings ... line. The duo who call themselves DFT draw familiar objects like trainers, animals, and hands – while never taking their pens off the paper.