This afghan is unusual as it is a mixture of knit and crochet. It relies on the comparative heights of the stitches to calculate the number of increases needed for each different stitch height. It mostly revolves around multiples of 12.
Made in one piece, from the centre outwards. Some rings are crochet, some are knitted. There are two types of knitted ring. One type is knitted in the conventional way, the other has rows at right angles to the rest of the work
The afghan shown was made entirely from left over yarn, by calculating how many stitches and how much yarn were needed on the various rings. The pattern has instructions for the afghan shown and also several tables to allow you to make your own unique circle using your choice of stitches.
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The crochet stitches range, in height, from double crochet to quintuple-trebles. The long, widely spread, stitches are quadruple-trebles and quintuple-trebles. The most compact are double crochet. The largest number of rings are made with trebles, as these help to stabilise the longer stitches. These do not cover the largest area. Mathematically, the arrangement of rings could be thought of as 48 rings, though some of those rings happen to be amalgamated into wider rings and others are split into very narrow rings.