Indiana Puzzle mathematical quilt, based of nested Baravalle logarithmic spirals, made by Elaine Krajenke Ellison, 2000.
The quilt is based on logarithmic spirals named after Hermann von Baravelle, who promoted education through play in the mid 20th century. The spirals are actually made of straight lines. A regular polygon, in this case a square, has the mid points of its sides joined to make a smaller version, and the process is continued until it is not possible to get any smaller. Certain triangles created are then shaded to form the appearance of a spiral. Mathematical quilts are associated with the Amish of Indiana. Because realism was frowned upon by the church, the Amish delighted in geometric designs.