The characteristic bursting out from the ground of the Sandworm reminds me of the Dune movie I saw about three years ago. I wanted to reciprocate the same effect but halfway through I decided to make the worm burst out of a rock instead. I didn't know what color to paint the rock since I had used the ones I intended on thd rock itself so I left it black.
The little bejoinings at the sides of the worm are also rock as I know very well from my little travel experience that rocks are not totally isolated solids.
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