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County officials correctly used the Genasys software to draw a polygon that would alert only residents near the fire, which sparked in West Hills.

But on rare occasions, designers choose to build their interactive worlds not from pixels and polygons but from physical materials like cardboard and clay.

“We want them to come back and be the classic beautiful white salt flats that they should be,” Andler said of her appreciation for the salt polygons.

Using survey information, experts will create polygons on a map showing areas of focus, Hiznay said.

They whittled down the area to what they came to call the polygon, which left them with several hundred homes around First Avenue in Massapequa Park, law enforcement officials said.