Winner's Circle
*442
Analysis of Winner's Circle
KEY:
1) red segments represent reflection mirrors
2) light green segments represent glide mirrors that are not reflection mirrors
3) dark blue segments represent translation generators
4) dark green segments represent shortest glide vectors that are not translation
generators
5) yellow points represent cyclic centers
6) light blue point represent dihedral centers
7) fundamental region is shaded pink
8) quilt block is shaded yellow
Symmetries present: reflection,
glide reflection, rotation, translation
Description of symmetries: There
are vertical, horizontal, and diagonal reflection mirrors
(i.e. at 45 degree angles) as shown. These mirrors are also glide mirrors.
4-fold dihedral rotation centers
are located at the intersection of 4 mirror lines; 2-fold dihedral rotation
centers are located at the
intersection of 2 mirror lines. The translation generators we chose are twice
the distance between the
horizontal and vertical mirrors. The shortest glide vectors are the same length
and direction as the shortest translation
vectors (the shortest diagonal glide vectors are marked because they are not
either of the two translation generators we chose.)
Description of fundamental region:
an isosceles right triangle that has mirrors
for sides (smallest one that can have mirrors for sides.) Note that the 4-fold
centers are located at the 45 degree angle vertices, while the 2-fold center
is located at the right angle.
Description of symmetries in a block:Blocks
have a 2-fold dihedral center, located at the center of the block. Note that
this block seems different in structure from the other *442 quilts, Carpenter's
Wheel, Red Geese, and Flying Geese. Also, the stitching on this quilt seems
follow the pieces as well as highlight the vertical and horizontal mirror
lines, while the pieces highlight the diagonal mirrors lines. In the other
*442 quilts, the pieces highlighted the vertical and horizontal mirror lines.
Relationship between block and fundamental region:A
block is 2 fundamental regions; unlike some of the other *442 quilts, the
relationship is exact.