Wow...that's amazing!!
But, I would imagine that they would have to "harden" the shells a bit to carve without breaking. Just guessing...maybe they didn't. Nice work anyway. 
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"Freedom is not given. It is our right at birth. But there are some moments when it must be taken." ~Tagline from the movie "Amistad"~
"The Akan concept of Sankofa: In order to move forward we first have to take a step back. In other words, before we can be prepared for the future, we must comprehend the past." From "We Did It, They Hid It"
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