The Golden triangle in a pentagon .
The short and long edges in the triangle (ie.the edge and diagonal in the pentagon) are in the ratio of 1 / F (the Golden section). The diagonal in the pentagon and the edge of the square are also in the same ratio.
Tapestry, 2 000.
The geometric design:Sigfrid Fregert. The colour design and weaving:Birgitta Fregert