Eight-Pointed Star and Precise Construction of 7x7 Square Grid
Dmitri Kozlov Proceedings of Bridges 2015: Mathematics, Music, Art, Architecture, Culture (2015) Pages 331–334
The paper explores two methods of constructing precise 7x7 square
grid based on the eight-pointed star by Tons Brunes. Both methods
are closely connected with the ancient proof of the Pythagorean
theorem for 3,4,5 right triangle and ad quadratum.