Instructional - template & disc for "impossible" challenge

thingiverse

An instructional challenge that involves passing a thin disc through an "impossibly" small opening. This design incorporates a thin disc and a template. The template is used to accurately draw a square on to a sheet of paper, from which a square hole is cut. The challenge: pass the thin disc through the square hole Rules: the paper must be kept intact - no tearing or further cutting is involved beyond the creation of the initial square hole. However folds are allowed and, in fact, required, to solve this challenge. Hint: it is advised to either use relatively sturdy paper and/or to reinforce the corners of the square hole to prevent accidental, non-intentional tearing.