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Mathematical Patchwork

Stage: 2 and 3
Article by Jenny Murray

There are two main forms of patchwork that I have come across. "English" patchwork is mainly based on tessellations, largely of squares and hexagons. "American" patchwork or "piecing" is usually based on patterns in squares that are built up into the finished quilt. There are many different kinds of designs. I find those based on an octagon in a square the most satisfying.

This pattern is called "Castle Wall". One square (made larger than usual) is a cushion cover.

castle wall pattern cushion cover

Here are some of the stages in making the design:

stages in design

My next octagon-based patchwork was a wedding present. The design is called "Kaleidoscope". Here is a small section of the finished quilt:

kaleidoscope design

The basic square is shown below on the left and on the right you can see what it looks like when it is put together:

basic square final pattern

Colouring it brings out the interlocking, almost circular, shapes in the design:

coloured design

Now I have started to make another quilt. It is a pattern known as "World without end" and it too is based on an octagon in a square.

The Kaleidoscope pattern is turned about so that the square is the centre of the pattern piece instead of the octagon. Two of the isosceles triangles are joined and then sliced the other way to make half of a rhombus.

base of world without end pattern

These diagrams show the transformations required:

transformations for world without end design

It looks like this when the squares are put together:

pieces put together coloured design

Again the design looks different when it is coloured. The changes are even more noticeable when the quilt is "pieced" from fabric.These are the first four squares out of thirty-six!

first four squares
I did not use a computer for making the pattern pieces for many years. They were constructed in the time-honoured way with a pair of compasses, ruler and graph paper. It can obviously still be done like this. My favourite book (see references below) on the subject actually shows how most designs can be made by paper folding. I never found this very reliable, but it is interesting mathematically. The most useful aspect of using modern technology is the ability to scale by any percent. This means that the design can be drawn out any convenient size and then scaled to what is needed. More about my quilting exploits can be found on my website . (See references below)

My advice to those who would design quilts is this: Go ahead and make the patterns, it's great fun, but only set out on cutting and sewing fabric if you are prepared for a long, hard slog!

References:
  • The best book on the subject is, amazingly, still in print after 24 years: Jinny Beyer Patchwork Patterns published by Bell & Hyman 1982.
  • Website: http://homepages.which.net/~jenny.murray/patchwork.htm