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I wonder what material is this.

Maybe old fishing nets and random plastic trash, considering its all recovered from beaches? Heh. Nah, perhaps hay/grass? Not sure what acts as a binding agent, either.

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Incorporating old, strong plastic filaments would be a terrific reuse idea.

I don't think the get enough disused fishing nets for that, and these nets would need a lot of cutting.

I helped with a study of the compression strength of concrete blocks when I was in high school. It was a long time ago, but IIRC, the blocks augmented with monofilament (it was fishing line) performed well.

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