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The book series draws its name, by the way, from the recording tape upon which the group imprinted their masterworks, those “ribbons of rust”—iron oxide bonded to polyethylene terephthalate.

To their surprise, most of the particles were not polyethylene terephthalate, or PET — the material most water bottles are made of.

One common one was polyethylene terephthalate or PET.

PET, or polyethylene terephthalate, is a type of clear plastic that is commonly used for single-use water bottles.

Lego said it has “decided not to progress” with making its trademark colorful bricks from recycled plastic bottles made of polyethylene terephthalate, known as PET, and after more than two years of testing “found the material didn’t reduce carbon emissions.”