Each disc is covered in a transparent plastic coating (either blue, green, yellow or red) which lets daylight filter through.

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To make a memory from the protein, Dr Birge suspends elements made from it in a transparent plastic cube known as a cuvette.

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Only the barest essentials - including passports and wallets - will be allowed to be carried on board in transparent plastic bags, the department said.

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It slipped enlarged photographs of the latent prints and the prints from Mr Mitchell into transparent plastic sleeves, and marked red dots on the sleeves to suggest which of Mr Mitchell's prints matched the latent ones and where.

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Three years later, they've got a phone on the market: a cute, palm-sized object that looks a bit like it's derived from the original Apple Computer (nasdaq: AAPL - news - people ) iMac, all curves and transparent tinted plastic.

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Is there anything other than a transparent piece of plastic to set it apart from the plethora of other touchscreen rectangles that live in the shadow of their top-tier peers?

ENGADGET

The transparent, tangerine-colored plastic aviator hats were a fun touch.

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Such materials might include plastic or photovoltaic glass, which changes from transparent to opaque at the flick of a button.

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They are plastic, very detailed and coloured, and even contain transparent areas.

ECONOMIST: Letters