So you have a sheet of A4 paper, and you can fold and cut it in such a way that you can get through it. But I just don’t know how. Can you explain this step by step? Thanks in advance.
Answer
Simply fold the sheet in half once and then cut out a spiral (see attached figure). You should start cutting on the folded side. The finer the spiral, the bigger the loop you will get when you’re done cutting (but also the more fragile the loop).

Answered by
dr. Jan Buytaert
Biomedical Physics and Optics: *middle and inner ear mechanics *electro-optics *tomography *interferometry *3D imaging *endoscopy *image processing *profilometry *topography *programming *classical physics

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