thank you for your help!
Thank you for the info and the welcome and the good wishes!
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From feedbacks i've got so far from folks in the Americas, Australia and Europe, it seems the crab as an art motif is ok with people everywhere around the globe. At another forum your countrymen even give me a list of resorts along American east coast where my friend could market his ware--tho I am not sure he has ever dreamed of doing business that far away from his home bay!
The crab in China is often a symbol of order-breakers and bullies; apparently because the creature's unique sideway walking style and powerful pincers tend to lead people think it's a strong-armer in the animal world who would push other walkers out of their way and hog the road. Thus the image of a steamed crab, with its body and legs all red and the pincers draped loose, symbolizes the bully who finally meets with what he deserves. Otherwise the crab has no negative connotations in China. It's sometimes also a motif of art, especially in traditional watercolor paintings depicting idyllic rural pond scene, along with other small water animals and plants. Its image is also commonly seen at sea resorts and on the billboards of seafood restaurants.
watercolor crabs by Jingjing, a 6-year-old kid