Sizing Border Patterns 1
A brief introduction to sizing border patterns
A variation on the guilloche pattern. This illustrates how, when you size up a border pattern that you can only increase or decrease the width so far before the pattern is disrupted.
 
A – B is about 27 tesserae C – D is much the same (it’s not exact, don’t try to make it, as you work with tesserae which are all of a slightly different size). This gives you your length of a full pattern and your width.
Adjust the width – have only 2 lines of colour in the bands or increase it by making it 4 lines of colour in the band. You also can add tesserae to the area covered by the letter D and to the circles but you need to look at the proportion of the other elements in your mosaic so that this border doesn’t become so large that it overshadows them.
Adjust the length – the angle at which the colour bands are set is 45 degrees. you could add more lines to the area covered by the letter D but you would then change the angle to less than 45 degrees
Extract from the Roman Mosaic Workshop Manual Vol. II  Geometric Mosaics,
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