I have a couple of comments:
I have seen a rabbit cast in brick (using a rabbit-shaped blancmange
bowl). Never under-estimate what humans will do with materials.
Nor are all bricks are made of brick. It seems to me that thesauri of
forms are best kept separate from thesauri of materials
Thesaurus are being used now as glossaries on online databases - this
may or may not influence your thinking.
Cheers,
Pat
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Pat Reynolds
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