Do you see purple on orange? Or orange on purple? The most obvious illusion is that caused by the clashing colours. You could be forgiven for believing that you can see curves but there are no curves, only triangles. The design consists of 24 identical squares creating Baravelle spirals.
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Strongly contrasting colours create the illusion of interchangeable background and foreground. Using less contrast usually defines one colour as being the background. The design can also be effective worked in multi-coloured yarn with long colour changes. Change the size of the afghan by making more, or fewer, blocks.
Made in 24 blocks which are stitched together. Each block is worked from the centre outwards by picking up stitches. Only one yarn is used at a time.
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Each of the squares is a Baravelle Spiral, which is defined as ‘a straight line design based on connecting consecutive mid-points of sides of regular polygons’. The polygons in this example are squares.