This is made of sheets of carbon, inside which electrons can flow smoothly, but between which they cannot easily jump.

ECONOMIST: Magnetism

The night was warm and Julian turned in his damp sheets, waking briefly at gray dawn and hearing someone walking, inside and out.

NEWYORKER: Idols

Colorful sheets of fabric were tied to upper floors of the wreckage, presumably so those inside could climb or slide down and escape.

NPR: 87 Dead In Bangladesh Garment Factory Collapse