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Better than a yoghurt tree, you could get a cow. Then you could produce your own butter, cheese, cream, yoghurt and a thousand other products including Perspex and glue (build your own airplane!)
caesin was used as the original substrate for Perspex, if I recall my elementary textbooks from 60 years ago.
Just found the source book I remembered, which has been on my shelf since 1955, and you're right, sort of. It doesn't mention casein at all! Where on earth did I get the idea?