The ribs of cacti are either fleshy branch like sections of the main trunk or perpendicular vanes that sit proud of the trunk. This structure is a survival mechanism, it allows them to swell and shrink, to manage dramatic rainfall fluctuations without cracking or wilting. Spines are both a protection mechanism, they prevent predators from munching on the fleshy part of the plant, give shade, impede water loss and insulate against the cold. So it was important that I had a similar structure in the felt – I solved this with multi- ribbed resists and vane like protrusions encased in a final layering of wool.
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